They add the following disclaimer about that:
> A person or company has the right to cease to work on a particular program; the wrong here is Microsoft does this after having made the users dependent on Microsoft, because they are not free to ask anyone else to work on the program for them.
which if that is the case, means the whole spiel at the beginning about non-free software not automatically being malware in the FSF's eyes pretty empty if "non-free software not supported forever" is malware.