Thats interesting, I am using lineage as well (oneplus 6t) and do have the app com.android.devicelockcontroller. This could be some junk added when I enable the gapps magisk module which I generaly keep dissabled though.

Excuse me, but real programmers use butterflies.

In addition to the other resources people have linked if you are interested in learning more about this type of scam take a listen to
Darknet Diaries episode 141: The Pig Butcher, it is very interesting.