A matter of time

One charge that was repeatedly leveled against Hegel's aesthetics by future philosophers of art was that of a somwhat sterile classicism due to his strict separation of good and bad art, that is, beatufiul and ugly artistic products.

Oughtn't that be "later"?  They're future philosophers with respect to Hegel, but if you wanted to go that route, wouldn't it have to be "will [or "would"] be repeatedly leveled"?  (Not to mention "somewhat" and ";".)