Okay, so after reading more posts I decided to made another post regarding to gliscor.
I would like to propose a comparison of Gliscor in gen 9 OU and Lando-T in gen 8 OU, the latter which is not cosidered to be broken, but has its own controversies in the tier. Since gen 8 have no gliscor, you had to use lando-t by default if you want to use ground/flying. In gen 9 ou, lando-t is simply not good by comparison at the very least, so clearly both dominates.
And then you look at their toolkits... yeah
Gliscor can passively heal much more than Lando -T ever could, accumulated by protect to strengthen it's longevity. SD on both are not really consider broken by almost anyone so lets skip that. And then, both are ground types are toxic users that are ground types, so it also cancels out. However, Gliscor has ALL THREE HAZARDS as opposed to only sr for lando. Getting up those hazards are not hard at all given the longevity of them, but poision heal elevated the bulk to increase the chances that you could get up multiple layer of hazards, as opposed to ever only able to set up one. Both have u-turn, knock off. Gliscor was pretty much just gen 8 lando-t but way way better. Not to mention that defog distribution has been severely limited, removing practically any defogger besides corviknight (which is a unreliable defogger due to ghold anyway and don't even always run the move), one viable rapid spinner (Great Tusk) which you also need ice spinner on the set to actually threaten it, and heavily afraid of toxic, and court change cinderace which lose to gliscor 1v1 anyway, and need to pair with Great tusk to even keep them off in the first place, which restricts teambuilding. It is possible to kill gliscor, but no matter what, it's spikes set (or the occasional stealth rock) always give value that had very little actual counterplay. The Combo of Gliscor plus Ghold really cant be stop reasonably without specificly building a team to counteract it, which is usually worse off against other playstyles(not going deeper into ghold to prevent off topic). Gen 8 Lando-T simply doesn't put as much constraints to team building as gen 9 gliscor does, especially when weavile is a top mon. Speaking of Weavile, this meta heavily lacks ice types. The only one was Ninetails-Alola which is a support mon, and usually just want to set up aurora veil. It also loses to ghold which is a common partner, so it really doesn't hurt gliscor. Especially cuz Gliscor runs protect, it can help stalling out veil turns. Otherwise, you had the at best B+ tier Weavile, which is not bad but not great either. It also does not switch into Gliscor. This is especially noticeable with the bax ban. Weavile is really popular in gen 8, limiting lando in some way,especially because lando lacks the longevity to withstand infinite assults. Gliscor is so good that people had to use their own gliscor to check it, and the SD set crush them with ease. There is no true bad matchups to Gliscor, unlike Lando where it could be limited against some structures. Versatility is good if you want a healthy meta, withstanding otherwise dangerous threads, hence why great tusk was not banned pre home. Gliscor is different. It do check a vary of threats, yes. But it also take advantage of them too hard
Conclusion: Again Plz Ban