Stupid thing to say on many different levels.
As pointed out by others,athletes didnt have the training knowledge,let alone standards they do today,the Yankees once had to put out a story that Babe Ruth had "eaten too many hotdogs" for why he wasnt playing one day,yeah 12 ounce hotdogs in a chilled glass with a frothy foamy head on them. Micky Mantle played half of his career hung over as hell. Also there werent any,"athletes little helpers",so at the very least we know Louis wasnt on any form of juice,nobody can say that about Evander.
Longer rounds and less rules,not that Evander doesnt lean on the rules of boxing as they stand so hard you can hear them creak. But Louis had to fight in an era with more time in there,and less rules while you were in there.

And the main reason why it was stupid,what purpose does it serve? He wasnt specifically asked about Louis. Whats the point of dissing a dead legend? Is it going to get him fans? Is it going to make boxing historians rethink their position on Holyfield? Or will it just piss a bunch of people off?