The records are still going up, yes, but how many of them are set raw these days? When Eder first crested over 400 lbs in bench press, he hit it at a body weight of 185, and did it on a public beach -- no bench shirt, no chalk, nothing fancy about what he did.
Grimek used to squat with poundages that would make most modern trainees' heads spin, and would crank it out for high reps. Feats that even modern lifters might have trouble with... never mind doing it without knee wraps, a belt, or a special squat suit.
This is not to belittle the strength athletes of today -- they do remarkable work and put heart and soul into their training. I think, though, that by the very nature of how ecclectic training was back then, that the original strongmen/bodybuilders were far more adaptable. Insane grip strength, excellent flexibility, fine proportion, and outrageous power.