Why ignore any evidence?
Also, I'm confused. Are you still saying that science has disproved that hypothesis (like you said it had initially)? Or are you no longer saying that?
Science has proved that the mechanisms of natural selection and genetic reproduction could not allow an ant lineage to produce an elephant in any length of real time and with the best designed environmental triggers.
Genetics just doesn't work that way.
But, at the same time, I grant that, given the right environmental pressures, an ant could beget a lineage that evolved gigantism, large ears, grey external skin, big ears, four legs, and a long prehensile nasal appendage. If you want to call that an elephant, fine. But it would still have remnants of ant DNA within it, and wouldn't have the same DNA coding for those things as modern elephants do.
I don't think that you understand the language of science and the related language of logic. "Proof" in the ideal sense, is that the assertion CAN'T be false - this only applies to logic, mathematics, and axiomatic thinking where contradictions can be put on paper to show something MUST be true given the assumptions (axioms). In the area of biology, the thinking relies on hypothesizing, testing, and analyzing. There is no PROOF of a positive claim, there is only evidence. Sometimes that evidence can be conclusive, but there might always be some exception that hasn't been encountered yet. There is also no disproving a potentiality. "It's possible that A=>B" can't be shown to be wrong with observational science - it can only be shown to not usually happen, or to not have happened in every case we've tried so far. But there might be something we're overlooking, or some circumstances that make A=>B, even if it's not the case in our day-to-day circumstances.
You asked:
Has "An ant can't spawn an elephant in X generations, no matter how great X is" been disproven?
I've tried to approach the problem from many different angles, seeing that you were ambiguous in your question. There's a double negative that I'm not sure that you meant. There's no reference to "proof" being the standard of the ideal type where the proposition needs to be shown to be logically certain (or necessarily self-contradictory in the negative) or to the standard of observational sciences. I've tried distinguishing between the specific "elephant" that we are used to, versus "an elephant-like organism that may not be genetically related to modern elephants".
So to answer your question once and for all: Maybe. It depends on what the hell you mean be at least 3 different terms.