Yes, many repacks include a modified lk.bin (little kernel) that bypasses bootloader locking. However, you still need to enable OEM Unlocking in Developer Options first.
To understand a "repack," we first need to understand stock firmware. firmware tcl 50 5g repack
If you are hesitant about repacks, consider downloading the from the TCL support site. However, official firmware: Yes, many repacks include a modified lk