Right, I know how to change the number of entities, but unfortunately it isn't my problem and it doesn't solve my problem.
About the other guy who supposedly bypassed the limit, I got wind that he had to hack the engine to get it changed and didn't use any kind of amxx/metamod plugin method.
So, I'm out of luck unless he wants to talk to me, which is doubtful as he's not the kindliest guys (at least with my experience).