Incidentally, this is very definitely not a rumor. Trevor Connors, whom the OP is citing as the "source", has an
article claiming it came from Maple Leafs Daily. Maple Leafs Daily, in return, in
their own article, say that this came from... PuckPedia's answer to Armchair GM.
The last sentence in the Maple Leafs Daily article starts with "Obviously, this isn't a trade that we expect to happen, nor has Laine been linked to the Maple Leafs in any way". (It then goes on to suggest the Leafs are losing the trade.)
So yeah, we make a lot of jokes about "rumors" coming from posts here on TR&FA or from Armchair GM, but this is actually exactly that.