Although there maybe hundreds of users of AU, only a few(50 to 100) actually visit meta.AU and even fewer actively participate here. So I am assuming that all other users of AU do not want there say in the site decisions and therefore what the active meta users decide can be safely considered de-facto rule/behavior-recommendation for all users.
Now this answer on the question When should I use the command-line tag? says
The tag is applicable to any and all questions where the OP has specified that they want a CLI and not a GUI solution.
I don't care what else it(the question) is about, if it is asking for a solution that is run from the terminal, it can be tagged as command-line.
This is supported by 20 users(upvotes+1) which is enough majority of the meta users.
Another answer on the same question says
I prefer a tag too much, rather than one too little. Better too much information, than too little.
Editing tags out that are not wrong, is vandalism.
This is supported by 7 users, which maynot be very good, but isn't bad either.
A comment by a user says the same in other words.
More tags is always better than fewer tags. That is clearly stated in the tagging guidelines and it also makes sense.
and has got enough support.
Based on above posts, I may say that what's going on is wrong.
Now to support my decision to rollback the edits(and to advice others to do so as well), this is what I have to say
There are only two solutions available on this issue, either edit the post or rollback the edit. As the edit is wrong and reediting the post to add just a single tag would be a minor edit, I recommend to rollback the edit as it would be appropriate.