This is being overstated. There's not any hard evidence suggesting he's been cheating over the board, and for such a potentially career-ruining allegation you'd want some pretty strong evidence.
Also, think about how much harder it would be to cheat over the board. You might use hidden devices, accomplices, secret signals--compare that to an online game where all you need to do is switch over to another tab to check the engine. Cheating OTB requires a significantly greater degree of forethought, planning, and commitment--a persistent and repeated willingness to cheat that is way less acceptable than an online player getting tilted and looking at an engine. Still cheating, yeah--but at least it's not premeditated.
It's the difference between cheating at a casual Poker game at home with no money staked and cheating at the World Series of Poker when serious money is at stake.