It's actually the dumbest argument.
Tavares not only replaces but improves JVR's production AND from a more premium position on the ice AND does not need to be sheltered to do so.
AJ or Kappy producing 43 points to replace Bozak isn't that far fetched, but if you consider the Leafs also "lost" Komarov this off-season (which apparently isn't an issue) and his 7 goals/19 points, AJ/Kappy together should be able to not only match the 18 goals and 62 points, but also improve on that. This is also ignoring the defensive gains from it.
Ok lets break this down
Kappy getting top 9 mins>>>>Koma ,,,more 0 ,just as good D and well lets face it,, we have not seen that Koma shift disturber in some time.
Tavares>>>>>JVR ,,,way way way better offence, it comes from a prime position, there is absolutely no doubt JT does elevate the production of his line mates , when folks say "he makes his linemates better" they are talking about a JT type player. Oh and the 200ft game is much better.
Bozak>Brown small intangibles loss but will gladly take that cap hit trade off.