OK, so I have finished watching the video and I will try to describe what is in it. The author has done a deep dive into the votes for Philadelphia on Nov 4 using the data on the NY Times website.
The author notices suspicious patterns. The votes are coming in at exact fixed ratios across multiple precincts. For example exactly 1 Trump vote per exactly 6 Biden votes. These "fixed ratio batches" are coming in for multiple precincts in discrete time segments. So, for say 2 hours, votes into a certain precinct are coming in at exactly at this 6:1 ratio. Then moments later the computer reporting votes in a different precinct at exactly this 6:1 ratio. It's not "averaging out at 6 to 1" like you might expect from an actual count, but it's coming in precisely fixed, exactly 6 Biden votes to 1 Trump vote. Again and again.
The author has identified an number of other ratios that were used to stuff the ballot boxes until the desired total was reached. At the 36 minute mark the author describes the scheme he's observed.
So it's a partial deconstruction of the Dominion vote stuffing or vote switching algorithm. Towards the end of the video, if you want to fast-forward, the author draws a helpful diagram that indicates how the scheme appears to work.
EDIT: The author of the video made this helpful summary graph https://ibb.co/h1x3Xds and he actually posts here https://thedonald.win/p/11QRkGgVT6/smoking-gun-i-discovered-dominio/
EDIT2: Let's get more eyes on this and see if we can find other cities where this type of fraud happened and see if we can make it into an easier-to-understand summary.