Tusk certainly has more competition for its role as a Bulky Utility/Glue Ground, but I wouldn't say it necessarily got worse into the Meta, which would be what I personally base a potential drop around. Teams ignoring Hazards can eschew Tusk, but then they have either concerns about stacking Weaknesses like Ice (Gliscor, Lando) or REALLY needing to lean on Knock Off Absorbers to preserve Boots/Leftovers. Besides Spinning, Tusk can be things like the Knock Off user, Wallbreaker, Defensive check, or a Win Condition with BU, and the team doesn't strictly give away what role(s) it plays on a team.
We see how rapidly the Meta adapts to things like Gouging Fire over the course of a Suspect, or the short period between Archaludon's low survey and high Rain Winrate, so even if Superman teams caused Tusk to drop, I would be confident adaptions to said teams would cause teams wanting Hazard control to catch up and raise Tusk right back up. Balance teams like the one Finch shared have multiple members afraid of its STABs and/or Knock Off removing their items (Zamazenta and Dragapult survives without Boots even if burning), I think you'd be hard pressed to find a match in which a team uses Tusk and it doesn't have work to put in with whatever set it pulls out of the Toolbox, which is at least what I personally attribute the S-Rank to: Pokemon who excel in one or more roles, and typically lack for flaws that make them replaceable on a team without major rework ripples due to how they play. Even if Lando-T competes with Tusk on several roles, Tusk is still competent and distinct enough in them that slotting Lando in does not guarantee the team remains equal or better as a single change
We see how rapidly the Meta adapts to things like Gouging Fire over the course of a Suspect, or the short period between Archaludon's low survey and high Rain Winrate, so even if Superman teams caused Tusk to drop, I would be confident adaptions to said teams would cause teams wanting Hazard control to catch up and raise Tusk right back up. Balance teams like the one Finch shared have multiple members afraid of its STABs and/or Knock Off removing their items (Zamazenta and Dragapult survives without Boots even if burning), I think you'd be hard pressed to find a match in which a team uses Tusk and it doesn't have work to put in with whatever set it pulls out of the Toolbox, which is at least what I personally attribute the S-Rank to: Pokemon who excel in one or more roles, and typically lack for flaws that make them replaceable on a team without major rework ripples due to how they play. Even if Lando-T competes with Tusk on several roles, Tusk is still competent and distinct enough in them that slotting Lando in does not guarantee the team remains equal or better as a single change