The blog was written by product management, and most likely legal just generally told them that they got their justification from the CCPA's definition of sale, and the PR/marketing just searched for it and gave it to the blog post's author. Since Wikipedia is usually the first result in a search engine (and even has its own infobox), that's probably what they went with.
You don't think Mozilla ought to have a firm legal opinion on this that doesn't involve just going to Wikipedia and going "yeah that's good"?