He's got a year in his contract at Collingwood, yes?
The Pies are in the mix of favorites to win the premiership, Freo, not so much.
Most players would cut off their right hand to win a premiership.
I wouldn't necessarily read him not being keen to come as "he doesn't ever want to play for Freo (with JLo)" but more so "he's got an outside shot at being a premiership player next year, and he's contracted at Collingwood", and can move to WA in 2021 when Freo have had some practice at JLos game plan and may be in finals contention.