beep boop
well your activity can still be tracked and eventually associated to your other internet activities.
but realistically nobody has any interest in what random facebook groups you join as long as its nothing legally complicated. so the questions is do you want to prevent your friends and family from seeing what you are doing, or do you want to do stuff that could get you in jail? if its the former then a separate account is sufficient. if its the latter then you should do a lot of reading.
Called it a few times before and its getting increasingly obvious with every month. Proton has entered the spiraling slide into enshittification.