You’re conflating “possible” with “probable”, and refusing to address possibilities you don’t have proof of.
When higgs bosons were predicted they were untestable. When gravity waves were predicted they were untestable. When black hole rings were predicted they were untestable.
Then we discovered how to build the sensors and instruments to test them.
You’re saying those scientists should’ve dropped their ideas because at that point it was still impossible to test or falsify.
What scientists do instead is to develop many different alternative theories, then design tests and experiments, and then once data is in then they decide what do believe about the theories based on what the could prove or not.
Edit: why are people like this so aggressively wrong in the dumbest ways… Not only did they pick only one of 3 examples of mine to attack and ignoring the rest, they also did so maximally incorrectly all while failing to understand the consequences of their own policy of rejecting anything you don’t know how to test.
The core of my argument is really just “sometimes scientists works on stuff nobody knows how to test, because maybe they’ll find out how in the future”, and this dude’s argument is essentially “if you don’t know how to test something it’s literally impossible for it to be true and therefore it shall be rejected, but also scientists always knows the path forward and therefore I don’t have to reevaluate my understanding of science”