Love the exclamation marks. So let's just use, for example, this definition: https://www.britannica.com/topic/ad-hominem
Here it's a type of argument, and it's only sometimes a fallacy. Seems like this how it's defined most of the time, unless you explicitly look for "ad hominem fallacy". Ad hominem without any context can be vague, I guess, so I tried to be more explicit.
I don't know, maybe I'm wrong, English isn't my first language, but I think "Obvious Fabrication" (capital letters) is a bit silly.