While this is true, I would assume that any forum such as this, which is created and run by people who ascribe to such politics, is already under observation by various governments.
It can also be assumed that they already know your IP and can get around any privacy-enhancing and security-enhancing options you have chosen to use. Thus they very likely already know your real name and all accounts associated with it. It is very, very difficult to not be watched by nation-state actors.
This does not mean that OP has not given good advice, it is still very good advice.
Absolutely, forgive me for my quick edit where I made more clear that I still think it is very good advice.