They don't the "nasty foreigners" to exist either, they just need the sentiment against them. Why else would that kind of populism also work in places with barely any kind of foreigner in sight?

Of course, imploding under the weight of the own corruption is not unique to the alt-right but it is the one thing that I have seen that brings them down again, not a reduction in migration, not super harsh laws against immigrants, or anything of that kind. I have not seen something else so far. They are fairly immune to reality, and they are getting more immune by the day as their voters are increasingly migrating into their own party echo chambers and shunning any other sources. So who knows, maybe the FPÖ won't implode the next time when the corruption piles up again. Its voters will defend it instead.