Compher has paced 0.5ppg for most of the last 3 years including playoffs, which over a full 82 game season is ~40 points.
Staying healthy has been his issue as he's usually missed 10-15 games per season which is why his points totals have ended up around 30-35. But that's still ~0.5ppg pace.
With that PPG it's not that outlandish to expect him to put up an extra ~10 points with an increase in minutes, even if he still misses a few games, especially as he'd be playing with vastly better players in Lehkonen and Rantanen than the bottom 6 players he's usually played with (eg. Jost, Comeau, Donskoi, NAK, etc).
For the record I've been a critic previously, but he did have a good postseason, and contract years are definitely a thing, so it's not hard to see how the Avs front office can convince themselves that he's a viable option at 2C for a few months until the TDL.