I don't think those are arguing that he wouldn't be a fit per se. They're arguing that he'd be such a fit as to improve their place in the standings thereby worsening their pick value. It's more strategic in how you approach the rebuild than saying Askarov wouldn't be a good fit.
The Sharks are at a point where they need to draft considerably well in quality and quantity to put a good young quality team together. They have two top six forwards under 25, no top four quality defensemen under 25, and both their goalies are UFA age at this stage.
Then when you look at their prospect pool, they have to be generous five top-six potential forwards, maybe two top four potential defensemen, and really nothing in net under contract. On their reserve list, they have maybe two top six potential forwards and maybe three top four potential defensemen. That's all probably on the generous side with very large potential for numerous failures because only Eklund and Zetterlund have shown to be capable NHL'ers at a high level. Smith, Musty, and Mukhamadullin are the only ones that seem to be good odds to be part of the answer in the future.
The Sharks need a lot more answers for the future internally before they can call pieces that would need to be available to get a guy like Askarov expendable. The results of the team is clearly not good enough to go out and nab a guy like him that will make your team better. But doing so without it being a solid bet to actually make the playoffs and compete is how you end up in situations like Ottawa taking a chance with DeBrincat and then having to move him because the team isn't as good as you think it is.