Alowaks analysis is pretty outdated, as the analysis says its niche is to check a group of Pokémon like tapu koko, white being a wall and stall breaker. Alowak can’t break stall anymore thanks to quagsire, and its not a reliable check at all to tapu koko and magearna. I would change the analysis to say it’s niche is on trick room teams, because alowak is super hard to fit on teams orherwise and there are much better wall breakers that require less support.
It can break stall still, Quagsire is barely 2HKO'd by Shadow Bone:
252+ Atk Thick Club Marowak-Alola Shadow Bone vs. 252 HP / 252+ Def Quagsire: 177-208 (44.9 - 52.7%) -- guaranteed 3HKO after Leftovers recovery
meaning that Quagsire switching in will be forced to Recover the turn after, meaning Alolan Marowak can fish for Defense drops if Quag switches in directly, as Earthquake does 78% max, meaning Marowak needs some chip damage for Quag to be able to deal with it. Well, Quagsire can't switch in then, but I guess it beats it 1v1 if it is send out after a KO, but even then, sacrificing a team member makes it easier for Marowak's teammates to deal with Quag. I mean, Quag is for sure a huge annoyance for Marowak, but it is far from unbeatable. As for its niche only being on Trick Room I disagree with that as well, it is tough to fit in, but it can still work on Bulky Offense, providing a decent switch in to Magearna and Koko. It might need a revamp still, idk, but I just want to point out that Trick Room isn't its only niche.