According to a post on SNYRangersBlog he was one of the youngest players in the SEL at 18/19, the youngest on his now-former team Farjstad, registered 2 points across 38 games, and averaged 7 minutes a night. What's disappointing with him wanting to develop at his own pace, one he's comfortable with, rather than trial by fire? Clearly he wasn't ready for a more advanced league.
The post includes a couple quotes: One from The Hockey News saying "Andersson was killing it on Farjstad’s junior squad with 9 goals and 17 points in 12 games, but only had one point in 18 games with the big club."
In an interview with Blueshirts United, Clark said of Andersson: "When the big goal or big play is needed, he's doing it..He practices a lot with the big team..They're doing the right thing letting him play a lot, letting him handle the puck a lot, let him play every power play, every 5 on 5, kill every penalty, that's what we would rather see than sitting on the bench with the big team and that's what they're doing and we're happy with that growth." Sounds like he's coming along just fine.