Funny what a human mind can dream up when it refuses to confine itself to convention.
A fine line, in that of course people can dream up just anything of course, such as 'flat Earth' etc.
Switching topics just a little, the reason Popper points out that falsifiability as a good quality in science (that a theory can be tested, potentially even falsified) -- and when we point it out, it's not just a personal preference or 'a nice extra to have', etc. -- no, it's rather the only thing we have that can help us know anything in the end, in the sense of knowing what is likely true. If we cannot eliminate theories, than endless competing untestable theories will arrive over time, and in time they will pile up, and we'd not be able to say much on whether one is more likely true than another, or a better path to investigate. (Let me use a hyperbolic example also -- suppose someone proposed there is no such thing as 'left', but there's only 'straight ahead, right or backward'. It would be an interesting theory, but fortunately we could falsify it, and so we wouldn't need to black out the left turn signals on our cars and close down the left turn lanes, etc. and wouldn't need to give driving students tips about how best to select a needed 3 right turns for some routes, etc.)
But with falsifiability, science can
progress over time more rapidly, and that's proven to be very potent to find new things that are very useful.
So, instead of worrying that a theory isn't falsifiable, I try to imagine or find ideas about how it might be tested, and am patient. But in the end, if it turns out 20 years later no one can come up with any way to test a theory, we have to admit it really (in a true way) is akin to a fantasy -- not bad, not at all bad, but also not really science, as Sabine Hossenfelder would say. (she's correct in a key way on that)
It's not that it's bad or wrongful or such. It's merely not of the progressing process we think of as the real thing, if it's truly untestable forever.
Better is to fantasize things that can be tested, of course, because that's potentially an avenue to progress.