Hi, thanks for swinging by!
I agree that popperian falsifiability is quite imprecise and surpassed. Popper in general has quite some flaws, from the rejection of inductive reasoning to the very strict rules about falsifiability.
One point is completely spot on though: The theory must be falsifiable. That doesn't mean that a falsification should make it invalid point blank, of course, but if no testing is possible it should not be considered science at all (which is oftentimes the case with religious claims).
I have read about Hossenfelder on reddit (check out /r/philosophyofscience, it's a nice sub), but I was a bit skeptical because of the aesthetical approach, which I find limiting and biased in science. Can you confirm that's her way of trying to solve the most tricky #PhilosophyOfScience matters?