Does not concern me at all.
According to the Liiga website he had 9 PPG in the regular season out of his total of 17 and 5 in the playoffs out of 10.
Jesse Pulj had 7 out of his 13 on the PP.
Barkov had 9 of his 21 goals on the PP during his draft year (while playing 7 more games)
Laine had 42 % of his points on the PP. Pulju had 39% and Barkov had 44% of his points on the PP in his draft year. Seems pretty reasonable to me them being all 17-18 yr olds in a men's league
Laine's line has a fantastic 5v5 CF%, ranking 3rd on his team of players who have played more than 15 games. I would be concerned if corsi numbers were bad as that would indicate him primarily dominating on PP and not doing much else but that's not the case with him. This shows me he is a very good player 5 on 5 who consistently pushes the play in the right direction.