The very page you link lists a logically sound ontological argument[1]. It appears to me that you're judging the argument fallacious because you don't like the conclusion.
The fallacy in that one is thinking that accepting those axioms is any different than directly accepting the conclusion. :) Stating a bunch of axioms and deriving something doesn't prove what you derived, except in a technical sense of the word "prove," not in a useful sense related to determining the truth. Even if we accept that Godel's logic was sound, there is plainly no more reason to believe in his starting point than there is to directly believe in the end.
What? You contradict yourself several times. Does accepting the axioms obligate you to accept the conclusion or not? First you say it does, then you say it doesn't. And proving something is of course quite literally "determining the truth", you can't just dribble it away like that. This comment looks like word salad intended to let the reader believe whatever they want.
Axioms are not something you ever prove, as in, they're not provable even in principle. I would not call this an axiom, this is simply a premise. It can be determined. You'd trace this premise back up a chain of premise-based arguments, and if all are valid, you eventually reach some of the 5-10 (I forgot) core axioms that underlie all of logic. And those are not provable, but you'd generally be considered mad not to accept them.
I'm not sure what you want to achieve by focusing on this topic. You just saying you don't agree with the axioms in the article, right? So just say that.