[Moto G 5G Plus Questions & Answers] Awilen:
BREAKTHROUGH TIME! I GOT INTO QCOM 9008 MODE!

In the attached photo are the EDL pads. Happy flashing!

Edit: now I'm getting some progress, but nothing is working. Here's the two logs I get, the first just after connecting, the second after having tried once already:

$ sudo ./qcom blank-flash
**** Log buffer [000001] 2022-12-02_19:02:50 ****

[ 0.000] Opening device: /dev/ttyUSB0
[ 0.000] Detecting device
[ 5.889] ERROR: sahara_greet_device()->change_mode()->do_hello()->Invalid command received in current state
[ 5.889] Check qboot_log.txt for more details
[ 5.889] Total time: 5.889s
[ 5.889]
[ 5.889] qboot version 3.86
[ 5.889]
[ 5.889] DEVICE {
[ 5.889] name = "/dev/ttyUSB0",
[ 5.889] flags = "0x60",
[ 5.889] addr = "0xFECAF690",
[ 5.889] serial_nix.device_pathname = "/sys/bus/usb/devices/1-3.2/1-3.2:1.0/ttyUSB0",
[ 5.889] api.bnr = "0x1FE4210",
[ 5.889] }
[ 5.889]
[ 5.889]
[ 5.889] Backup & Restore {
[ 5.889] num_entries = 0,
[ 5.889] restoring = "false",
[ 5.889] backup_error = "not started",
[ 5.889] restore_error = "not started",
[ 5.889] }
[ 5.889]

$ sudo ./qcom blank-flash
**** Log buffer [000001] 2022-12-02_19:03:50 ****

[ 0.000] Opening device: /dev/ttyUSB0
[ 0.343] Detecting device
[ 34.920] ERROR: sahara_greet_device()->change_mode()->do_hello()->IO error
[ 34.920] Check qboot_log.txt for more details
[ 34.920] Total time: 34.920s
[ 34.920]
[ 34.920] qboot version 3.86
[ 34.920]
[ 34.920] DEVICE {
[ 34.920] name = "/dev/ttyUSB0",
[ 34.920] flags = "0x60",
[ 34.920] addr = "0xAEF35240",
[ 34.920] serial_nix.device_pathname = "/sys/bus/usb/devices/1-3.2/1-3.2:1.0/ttyUSB0",
[ 34.920] api.bnr = "0x21BC210",
[ 34.920] }
[ 34.920]
[ 34.920]
[ 34.920] Backup & Restore {
[ 34.920] num_entries = 0,
[ 34.920] restoring = "false",
[ 34.920] backup_error = "not started",
[ 34.920] restore_error = "not started",
[ 34.920] }
[ 34.920]

Edit 2: I got a blankflash to work! Now I don't know... This is what I got:

D:\blankflash>.\qboot.exe blank-flash
Motorola qboot utility version 3.86
[ -0.000] Opening device: \\.\COM3
[ -0.000] Detecting device
[ -0.000] ...cpu.id = 286 (0x11e)
[ -0.000] ...cpu.sn = 3786473903 (0xe1b101af)
[ -0.000] Opening singleimage
[ -0.000] Loading package
[ -0.000] ...filename = pkg.xml
[ -0.000] Loading programmer
[ -0.000] ...filename = programmer.elf
[ -0.000] Sending programmer
[ 0.109] Handling things over to programmer
[ 0.109] Identifying CPU version
[ 0.109] Waiting for firehose to get ready
[ 3.220] ReadFile() failed, GetLastError()=0
[ 3.330] ...SM_SAIPAN 2.0
[ 3.330] Determining target secure state
[ 3.330] ...secure = yes
[ 3.377] Configuring device...
[ 3.377] Skipping UFS provsioning as target is secure
[ 3.377] Configuring device...
[ 3.470] Flashing GPT...
[ 3.470] Flashing partition with gpt.bin
[ 3.470] Initializing storage
[ 3.517] ...blksz = 4096
[ 3.580] ReadFile() failed, GetLastError()=0
[ 4.049] Re-initializing storage...
[ 4.049] Initializing storage
[ 4.361] Flashing bootloader...
[ 4.361] Wiping ddr
[ 4.392] Flashing abl_a with abl.elf
[ 4.439] Flashing aop_a with aop.mbn
[ 4.486] Flashing qupfw_a with qupfw.elf
[ 4.517] Flashing tz_a with tz.mbn
[ 4.783] Flashing hyp_a with hyp.mbn
[ 4.839] Flashing devcfg_a with devcfg.mbn
[ 4.854] Flashing keymaster_a with keymaster.mbn
[ 4.901] Flashing storsec_a with storsec.mbn
[ 4.933] Flashing uefisecapp_a with uefi_sec.mbn
[ 5.089] Flashing prov_a with prov64.mbn
[ 5.104] Flashing xbl_config_a with xbl_config.elf
[ 5.151] Flashing xbl_a with xbl.elf
[ 5.649] Rebooting to fastboot
[ 5.665] Total time: 5.665s

Somehow it worked, I got to flash another phone's blankflash (a "Racer" codenamed phone apparently) on it and the ABL (the thing that tells me it won't boot because it didn't find a valid system) changed visually. Now I'll try to unlock the bootloader, or flash a system on it.

Edit 3: Mmh. After clearing that EDL mode flashing worked, the system is still flashing-locked, secured, and fastboot oem unlock <unique_key> isn't working.