The AHL is not usually that big of a factor in the SHL really, I don’t think, unless players themselves want to go there to make a push for an NHL spot (for “overaged prospects” with NHL dreams this is sometimes the case, such as Fredrik Händemark to start this season), or unless the players aren’t deemed to get enough quality ice time in the SHL (Victor Berglund might be a good example: he’s a very flawed talent whose offensive upside couldn’t cover for the black hole he was defensively at the SHL level, where ultimately he was entirely used as a powerplay specialist; now he’s bouncing between the AHL and ECHL where I’m guessing that they can afford him the ice time needed to work on his game).
There are exceptions but players are usually pulled when deemed close to NHL ready, in my experience, and the SHL is appreciated for its ability to develop talent. For Luleå, the one exception I can think of was Lucas Wallmark, who had been the #1 centre for Luleå the season before his call-up to the Checkers. However, he probably was considered at the margins of making the Hurricanes at that point, so it’s likely they wanted him ready to go for the season, despite only getting 8 games in with the NHL team throughout the year.
Jesper Sellgren was also a guy I think Luleå would have held onto if not the Hurricanes had asked for his services in the AHL, first and foremost, but he was also probably considered at the fringe of making the NHL roster.
But my main point is: I don’t think the AHL factors in that much into the SHL talent drain. The vast majority of SHL players lost to the AHL are there because they’re considered close to making an NHL roster, to try out their luck, or because they aren’t getting enough developmental ice time in the SHL. In any case, these players are usually not the best SHLers, and/or gone only briefly. Occasionally there are guys who’d make strong additions to an SHL team lost floundering at the fringe of the NHL for years, such as Mattias Tedenby, but I don’t know how big of a factor these guys are.
The NHL, KHL and NL are much bigger culprits in the talent drain.