There is a snag, one that Popper didn't understand either, but which makes this all the clearer: predictions are never proven correct in science. They are shown

There is a snag, one that Popper didn't understand either, but which makes this all the clearer: predictions are never proven correct in science. They are shown to be "not false within the bounds of statistical and measurement error". So one guy doing well at least shows he is "not wrong", but within arbitrarily large error margins, because he is just one guy and it might all be just a coincidence. Only if you repeat the experiment a sufficient number of times you will arrive at error margins that are not laughably huge. So the feedback loop doesn't mean anything really, beyond weeding out huge mistakes (huge as in: same magnitude as the error bars). Because it is always just one guy, no numbers, no statistics. To get back to Popper: Newton's gravity wasn't really proven wrong, it just had its error bars known and explained. Einstein's general relativity is more precise, therefore less wrong and can explain Newtons error bars. But Newton's gravity is still right enough for almost all purposes. So it isn't falsified in Popper's sense, it is refined.