Well, in hopes that you're not just trolling, maybe you'll believe a dictionary that "stable" is ambiguous in this context. Because this is one of the listed meanings:

(computing) Of software: established to be relatively free of bugs, as opposed to a beta version.

https://en.wiktionary.org/wiki/stable#Adjective

It also lists your meaning. I'm not saying that you're wrong. I'm saying it's ambiguous, i.e. there's two meanings that could apply here.
Well, and personally, I do feel like more people will interpret "stable" to mean bug-free here, because Debian is a piece of software to them.