It might be/have been a "world record" based on some fed, but in reality, it's simply not. And Wendler has both squatted a grand, and gotten a lot of people stronger with his program. That being said, you're buddies are correct, imo. You need the heavier work on top of the prescribed 5/3/1 sets. 5/3/1 for Powerlifting covers this very, very clearly. It gives you two options of doing so: the 5+, 3+, and 1+ sets you already know about, and the other option of adding heavy triples after youre regular 5/3/1. For instance, your bench training max is 255, on your 3s day:
230x3 (Don't do 3+, just 3)
You aren't disallowed from benching 255 or more, it's just not required.
Not only that, but the program leaves room to just stop on the 230x3 and be done if you are lifting like crap, and still leave the gym with progress. It really is a pretty ridiculously simple program. If you can't wrap your head around how it will end up working, no worries. Do what your buddies tell you to. If you actually lift hard you will get stronger either way, guaranteed.