First of all let me state, that I really dislike the word "burninate". Especially for this situation, where you seem to have a just cause.
Secondly, I am very, very strongly against deleting the tag. I was once under the impression, that the tag is essentially the same as the nomenclature tag.
The usage explicitly states that the tag shall not be applied for nomenclature:
This tag should be applied to questions about the organisation IUPAC. For questions about nomenclature the appropriate tag should be applied.
There will always be the misuse of tags, that is simply something we cannot avoid. I think there are generally only very, very few questions on this site, that do not get edited. The example question you linked certainly had a lot of potential for editing. The removal of a wrong tag is then just a minor inconvenience.
If a users do not want to read the guidance, than we cannot force them in any way. But at least this way there is a guidance. In this way we might avoid one or two mistags.
While you might delete that tag, it may not be gone forever. The problem in this scenario are users that are still quite new, but have gathered enough reputation (300) to create tags. Many of them will not read this discussion or the one linked, and have a different understanding of the generic "IUPAC", they might be inclined to create this tag again.
If the tag is removed, any of tag-wiki is gone, leaving the tag in a state where it has to be cleaned up. You don't gain anything by removing the tag from the system. (You may want to have an occasional look at the new tags to understand what tags are sometimes created. In many occasions there are some cringe worthy ones.)
In short, I want to keep the tag, but it is a community decision.
Upvote this post if you want to keep the tag.