There are english captions for the first video, I referred to 3:00 onwards for the specific portion on memory topology.
Video #2, I've paraphrased the content on the comment #6 and that both QVLs of the Godlike Gaming and Extreme are referenced (T vs. Daisy chain on 2 DIMMs)
Toppc goes on to mention On-Die Termination's (of DDR4 ICs) in relation to T and Daisy chain layouts and that both slots on T need to be populated for extended OC margin for a "perfect signal" since there's a trace related to ODT on both A1 A2 and B1 B2 slots. That's unlike the daisy chain topology.
Video #3, just a video on "Dragon Alliance"... A couple of DRAM models with a stable IC supply (e.g. Hynix-A only, Hynix-C only) are picked from RAM vendors for demonstrating the benefits of daisy chain in a 2 DIMM config, MRC tuning were done on a number of these kits for an MSI certified auto overclock beyond XMP rating. e.g. A Corsair XMP-3600 kit with a designated IC running 4000MHz instead.
Video #3 is related to another topic in his motherboard series on DRAM sorting from "module houses" (corsair, gskill etc) and how were the QVLs built on 4/6/8 PCB layer T-top 2DPC or 1DPC QVLs etc. Regardless, both Overall, Toppc and Raja referred to 4 DIMM being the ideal config for a T-topology motherboard for an extended OC margin.
Daisy chain on Ryzen: Crosshair VII Hero, on an article authored by The Stilt
Elmor's C7H PDF extract on memory OC margin for this particular daisy chain board