Ventura docs for M2 Macs in this comment: https://gist.github.com/henrik242/65d26a7deca30bdb9828e183809690bd?permalink_comment_id=4555340#gistcomment-4555340
Old Monterey docs in this old revision: https://gist.github.com/henrik242/65d26a7deca30bdb9828e183809690bd/32c410e3a1de73539c76fa13ea5486569c4e0c5d
Solution for Sonoma: https://gist.github.com/sghiassy/a3927405cf4ffe81242f4ecb01c382ac
The last I recall from 2-3 years ago is checkm8 is for iPhone 4S (A5) through iPhone 8/X series (A11). This includes T2 which is related to A10. There was some news of Checkra1n being able to have some support for M1 (A14) chips but I never heard much about it.
As for the video, it starts with is the same instructions in these comments and then goes to do things not needed, but potentially can work. In theory the instructions have you disable some security and run a program that could do some of the steps listed in the comments (or some hidden unknown method). However, I don't have any proof of what it is doing, so I can't say it really is "safe" or will work.