It's coming from the FDA. They don't just say things without having the body of science behind them.
But, if you're interested in seeing if anyone ever tries to get Ivermectin approved as a treatment in the US, you can follow the FDA's Coronavirus Treatment Acceleration Program (CTAP):
CTAP will use every available method to move new treatments to patients as quickly as possible
www.fda.gov
To my knowledge no entity has applied for proper clinical trials for testing Ivermectin as a possible COVID treatment. There's only the studies we've already discussed, in which they were either retracted, found to be too small to be conclusive, or were focused on
in vitro preliminary testing. One thing that should stand out to you however, is that any of those studies you cited throughout the thread had stood up to serious peer review, someone would have used the results to apply to the FDA for a CTAP approval for trials - because there would be a ton of money to be saved in developing countries who cannot afford the vaccines or expensive treatments like Regeneron.