I gues that's not the method because some videos were uploaded minutes or hours while the method you mentioned it takes two days before it published.This is easy and it has been out there since 2017-2018. The only secret they do is they buy aged monetized channel, upload videos with gameplays and when the video is blocked (which can be after few hours or few days) they trim it and leave the gameplay only till the payday comes. This is a churn and burn method and not suggested to do it.
Adsense deducts ur earnings if they demonetize the channel before the payday.
The "trim" thing has been discussed and even sold here in this forum.