[Fire TV Android Development] Skel40:
I'm sure it is. I double checked the updater-script and it says this

(getprop("ro.product.device") == "mantis" || getprop("ro.build.product") == "mantis") || abort("This package is for \"mantis\" devices

this is a \"" + getprop("ro.product.device") + "\".");

ifelse(is_mounted("/system"), unmount("/system"));

package_extract_dir("install", "/tmp");

set_metadata("/tmp/backuptool.sh", "uid", 0, "gid", 0, "mode", 0755);

mount("ext4", "EMMC", "/dev/block/platform/soc/11230000.mmc/by-name/system", "/system", "");

run_program("/tmp/backuptool.sh", "backup");

unmount("/system");

ui_print("Copying system image...");

block_image_update("/dev/block/platform/soc/11230000.mmc/by-name/system", package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat");

ui_print("Copying vendor image...");

block_image_update("/dev/block/platform/soc/11230000.mmc/by-name/vendor", package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat");

mount("ext4", "EMMC", "/dev/block/platform/soc/11230000.mmc/by-name/system", "/system", "");

delete("/system/bin/efuse_check.sh",

"/system/bin/ewriter");

unmount("/system");

ui_print("Copying kernel...");

package_extract_file("boot.img", "/dev/block/platform/soc/11230000.mmc/by-name/boot");

package_extract_dir("magisk", "/dev/tmp/install");

set_metadata("/dev/tmp/install/install-magisk.sh", "uid", 0, "gid", 0, "mode", 0755);

run_program("/dev/tmp/install/install-magisk.sh");

mount("ext4", "EMMC", "/dev/block/platform/soc/11230000.mmc/by-name/system", "/system", "");

run_program("/sbin/mkdir", "/system/addon.d");

run_program("/tmp/backuptool.sh", "restore");

unmount("/system");

Whereas with the original stock 6.2.8.0_3236, it activates some type of blocklist from Amazon without the disable efuse_check in this updater-script:

So to answer your question, yes it disables the efuse in the modded rom. The script is important when flashing zips and why only flashing rbox's pre-rooted roms are necessary. He edits the scripts from the stock rom to make it compatible with rooted 4K devices so the efuse stays disabled under that line he added above.

So in conclusion, when you extract the pre-rooted rom, you'll see the META-INF/com/ without all the Amazon stuff added to it to make it disable the efuse under their scripts because these scripts tell the operating system to block anything from being modified

getprop("ro.product.device") == "mantis" || abort("E3004: This package is for \"mantis\" devices; this is a \"" + getprop("ro.product.device") + "\".");

ui_print("Target: Amazon/mantis/mantis:6.0/NS6280/3236N:user/amz-p,release-keys");

show_progress(0.650000, 0);

ui_print("Patching system image unconditionally...");

block_image_update("/dev/block/platform/soc/11230000.mmc/by-name/system", package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat") ||

abort("E1001: Failed to update system image.");

show_progress(0.100000, 0);

ui_print("Patching vendor image unconditionally...");

block_image_update("/dev/block/platform/soc/11230000.mmc/by-name/vendor", package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat") ||

abort("E2001: Failed to update vendor image.");

show_progress(0.050000, 5);

package_extract_file("boot.img", "/dev/block/platform/soc/11230000.mmc/by-name/boot");

show_progress(0.200000, 10);

package_extract_file("images/logo.bin", "/dev/block/platform/soc/11230000.mmc/by-name/logo");

package_extract_file("images/lk.bin", "/dev/block/platform/soc/11230000.mmc/by-name/lk");

package_extract_file("images/tz.img", "/dev/block/platform/soc/11230000.mmc/by-name/tee1");

package_extract_file("images/tz.img", "/dev/block/platform/soc/11230000.mmc/by-name/tee2");

package_extract_file("images/preloader.img", "/dev/block/platform/soc/11230000.mmc/mmcblk0boot0");

package_extract_file("META-INF/com/amazon/android/target.blocklist", "/cache/recovery/last_blocklist");

set_metadata("/cache/recovery/last_blocklist", "uid", 0, "gid", 0, "mode", 0444, "capabilities", 0x0);

set_progress(1.000000);