[Note 7 Guides, News, & Discussion] @Class:
Well at least some of dm_verity is inside boot.img's ramdisk

I'm going to say some yes, some no. verity_key is inside the ramdisk from boot.img. Also dm_verity_signature_checker inside the ramdisk sbin.

But if you managed to flash via dd and adb there is definitely hope as there's a security hole for even getting that far. I have until the 2nd of September to return for the SM-N930FD variant. Time well wasted.

[root@localhost ramdisk]# ll
total 2840
drwxrwx--x. 2 root root 4096 Dec 31 1969 data
-rw-r--r--. 1 root root 1011 Dec 31 1969 default.prop
drwxr-xr-x. 2 root root 4096 Dec 31 1969 dev
-rw-r--r--. 1 root root 105451 Dec 31 1969 file_contexts
-rw-r-----. 1 root root 1398 Dec 31 1969 fstab.qcom
-rw-r-----. 1 root root 1030 Dec 31 1969 fstab.qcom.fwup
-rwxr-x---. 1 root root 1707968 Dec 31 1969 init
-rwxr-x---. 1 root root 3948 Dec 31 1969 init.carrier.rc
-rwxr-x---. 1 root root 3301 Dec 31 1969 init.class_main.sh
-rwxr-x---. 1 root root 3221 Dec 31 1969 init.container.rc
-rwxr-x---. 1 root root 1446 Dec 31 1969 init.environ.rc
-rwxr-x---. 1 root root 1730 Dec 31 1969 init.mdm.sh
-rwxr-x---. 1 root root 7054 Dec 31 1969 init.qcom.class_core.sh
-rwxr-x---. 1 root root 8001 Dec 31 1969 init.qcom.early_boot.sh
-rwxr-x---. 1 root root 14126 Dec 31 1969 init.qcom.factory.rc
-rwxr-x---. 1 root root 33919 Dec 31 1969 init.qcom.rc
-rwxr-x---. 1 root root 2200 Dec 31 1969 init.qcom.sensors.sh
-rwxr-x---. 1 root root 9308 Dec 31 1969 init.qcom.sh
-rwxr-x---. 1 root root 2962 Dec 31 1969 init.qcom.syspart_fixup.sh
-rwxr-x---. 1 root root 79905 Dec 31 1969 init.qcom.usb.rc
-rwxr-x---. 1 root root 8311 Dec 31 1969 init.qcom.usb.sh
-rwxr-x---. 1 root root 72319 Dec 31 1969 init.rc
-rwxr-x---. 1 root root 2118 Dec 31 1969 init.rilchip.rc
-rwxr-x---. 1 root root 1010 Dec 31 1969 init.rilcommon.rc
-rwxr-x---. 1 root root 508 Dec 31 1969 init.rilepdg.rc
-rwxr-x---. 1 root root 12990 Dec 31 1969 init.target.rc
-rwxr-x---. 1 root root 6603 Dec 31 1969 init.trace.rc
-rwxr-x---. 1 root root 9283 Dec 31 1969 init.usb.configfs.rc
-rwxr-x---. 1 root root 4534 Dec 31 1969 init.usb.rc
-rwxr-x---. 1 root root 342 Dec 31 1969 init.zygote32.rc
-rwxr-x---. 1 root root 614 Dec 31 1969 init.zygote64_32.rc
drwxr-xr-x. 2 root root 4096 Dec 31 1969 oem
-rw-r--r--. 1 root root 2088 Dec 31 1969 postrecovery.do
drwxr-xr-x. 2 root root 4096 Dec 31 1969 proc
-rw-r--r--. 1 root root 14943 Dec 31 1969 property_contexts
-rw-r--r--. 1 root root 1509 Dec 31 1969 publiccert.pem
drwxr-x---. 2 root root 4096 Aug 21 18:02 sbin
-rw-r--r--. 1 root root 10554 Dec 31 1969 seapp_contexts
-rw-r--r--. 1 root root 600753 Dec 31 1969 sepolicy
-rw-r--r--. 1 root root 487 Dec 31 1969 sepolicy_version
-rw-r--r--. 1 root root 35642 Dec 31 1969 service_contexts
drwxr-xr-x. 2 root root 4096 Dec 31 1969 sys
drwxr-xr-x. 2 root root 4096 Dec 31 1969 system
-rw-r--r--. 1 root root 13390 Dec 31 1969 ueventd.qcom.rc
-rw-r--r--. 1 root root 5294 Dec 31 1969 ueventd.rc
-rw-r--r--. 1 root root 524 Dec 31 1969 verity_key

[root@localhost ramdisk]# ll sbin
total 6992
-rwxr-x---. 1 root root 1023984 Dec 31 1969 adbd
-rwxr-x---. 1 root root 330112 Dec 31 1969 bgcompact
-rwxr-x---. 1 root root 901520 Dec 31 1969 dm_verity_signature_checker
-rwxr-x---. 1 root root 426512 Dec 31 1969 dm_verity_tz_cmd
-rwxr-x---. 1 root root 457856 Dec 31 1969 e2image_blocks
-rwxr-x---. 1 root root 366960 Dec 31 1969 emmc_quickverify
-rwxr-x---. 1 root root 1207024 Dec 31 1969 ffu
-rwxr-x---. 1 root root 350672 Dec 31 1969 filefrag_blocks
-rwxr-x---. 1 root root 957 Dec 31 1969 firmware_key.cer
-rwxr-x---. 1 root root 646720 Dec 31 1969 healthd
-rwxr-x---. 1 root root 350640 Dec 31 1969 knox_changer
-rwxr-x---. 1 root root 362992 Dec 31 1969 mdtp_fota
-rwxr-x---. 1 root root 350656 Dec 31 1969 qseecomfsd
-rwxr-x---. 1 root root 346608 Dec 31 1969 sswap
-rwxr-x---. 1 root root 10096 Dec 31 1969 sverifysignature
lrwxrwxrwx. 1 root root 7 Aug 21 18:02 ueventd -> ../init
lrwxrwxrwx. 1 root root 7 Aug 21 18:02 watchdogd -> ../init