Just had a quick look and for a guide that repeated describes itself as “in depth” it seems to only focus on the biggest 4 names in consoles: Nintendo, Sega, Microsoft and PlayStation. It even misses out Atari. Plus there isn’t even every console from those big 4 companies within the time periods it focuses on.

It also includes portables with the home console generations and that’s not how people generally discuss portables.

It starts off at the 3rd generation of consoles (there’s a whole era of gaming that predates the “crash”).

And lastly it’s also very American specific (eg talking about “the crash” which was an American phenomena and didn’t affect Europe nor Japan).

In short, it’s a good start but it’s a looooong way off being in-depth.