People tend to forget about 1 thing. People asked his agent if he would like to play for MTL and he said yes. They never asked if he would like to play elsewhere...
There’s a dozen other mentions of him wanting to be in Montreal from various writers including Arpon Basu/Murat Ates who wrote that PLD attended last years start thinking he was being acquired by the Habs. Kypreos has stated he’s coming to Montreal and has made it known -
"I see him in Montreal this summer at 100 miles per hour. He will not stay in Winnipeg long term. From what I hear, nothing will change his mind, not even a Stanley Cup!”
Elliot Friedman also weighed in:
"Jets have talked to the Canadiens on and off about Dubois, we know that Dubois is gonna end up there 95%, is there someway we can make a deal so the Canadiens get him earlier and we get something we want? They've talked about that"
Lebrun has talked about Montreal and the Jets having had extensive talks about PLD.
But yeah. The agent only mentioning Montreal was an isolated incident of accidentally spilling the beans on one team. Pat Brisson is known for being not that smart in negotiations and in the media. Probably a complete accident on his behalf.