The tag [accesibility] is a misspelled version of the [accessibility] tag. I would suggest this to be deleted.
On inspection it turned out that only one question had that misspelled tag. I therefor submitted an edit so the tag was no longer used on any question. Once the edit was reviewed and approved there were zero questions with the misspelled tag.
After 03:00 UTC the system runs a cleanup batch to remove so called "zombie" tags.
The timing of all actions was perfect as the tag is now indeed gone.