Well, you know, UK became a shitty kind of US country that most European did not want to move to

Boris Johnson introduced a points based immigration system and a lot of Indians, Pakistanis and Nigerians used that to go to the UK. At the same time most EU migrants were from the poorer eastern members and they have caught up a lot. Places like north England are not that much richer then Poland for example.

Didn't a similar thing happen in Italy with Meloni?

Damn, what could have happened between 2020 and 2022 that would cause an enormous number of non-EU refugees to flood westward?

It’s almost like they don’t actually care about the things they promised before Brexit

Not caused by that or even correlated. Correct answer is in other comments.