There are many (many!) who moved to Portugal and are not anything like that.
In fact, brazilian immigrants are, as equal as ukranians, known as "the good immigrants" (ugly i know, but it's how they are seen) as they integrate very well, are nice neighbours/workers, and usually are just nice people who came just looking for a better life.
What i think is being described is a bunch of bolsonarists who also migrate thinking Portugal is a paradise people who think like them, when they actually forget our nation is governed by a socialist government haha
Moving to Portugal I would only consider if to work full remote, as it is the case of many americans and other foreigns who can keep their good foreign salaries but living in the cheap Portugal. My type of job allows that (some friends of mine did it), but again, there are still things there that annoy me more compared to the things i like in the netherlands