By "online" do you mean a random ROM website, or any Yuzu provided/hosted/whatever page? I.E. are they linked to such firmware and key redistribution? I was under the impression there was no affiliation, but I may be wrong there.
By affiliation I mean something like hosted on the same server but officially unlinked, not obvious affiliations. If a core maintainer redistributing them on their personal website.
its just yuzus docs thats written in such a way, most likely to avoid nintendo suing them…