I wouldn't take what he said literally but he makes a valid point.
Nylander is a much better player now then he was a few years ago and over the last three years, he's put up PPG in the playoffs. He's managed to do that with less ice time than M&M, and without M or M as a linemate. Hell these last playoffs, Keefe in his infinite wisdom (bwahahahahahahaaaa) even took him off PP1 yet he kept on producing. My eye test also tells me that there were a number of games where we badly needed a goal, M&M looked like they were MIA and Nylander was the only one who hadn't given up and he was still buzzing out there creating chances.
In the playoffs over these last 3 seasons, Nylander has not been outplayed by M&M in the playoffs, in fact you could argue he's been the best out of the three of them so when you factor in cap hit, he's been by far the best playoff asset out of the three. If you have to move on from a core piece and you want to win in the playoffs, Nylander's not the guy you move.