Erroneous material? Mind providing an example? The website looks a bit sketchy/weird but the chapters themselves (which you can see a bit with preview) were nearly identical to the lectures my professors gave.
It's 400 pages but I think you could get through the 400 pages faster than 100 pages of TBR for ex. I ordered physics/orgo/genchem/bio TBR books already. Idk it just worked really well for me in terms of review.