I can't know what Stallman meant exactly and what are his intentions, but from reading the text I believe what he tries to do is to either create a neologism (cf. "enforce a meme"), or avoid a word misuse that may lead to some invalid connotations or suggestions (cf. calling a photocopier "xerox"). Probably both, but the latter case is important.

There are a lot of cases where saying an established term for something (with term invented and enforced by marketing/politics) serves in favor of some an agenda, and one may deliberately decide to change the language to combat this. Consider that Stallman's also known to ask to avoid calling copyright infringement as "theft" or "piracy".

Avoiding agendas, almost certainly not the case with "democra[tp]s", as it's just name-calling. Most likely it's the case with "piracy", as using this term mixes in some incorrect allusions. And, while personally I think "useds" instead of "users" isn't a good idea, it's probably somewhere in the gray area in the middle that may have some reasonable justification besides just Stallman trying to pull a strawmen.