Are you quoting the wiki there? This page has that almost verbatim, except it actually says "2.3 or 2.4, possibly even later" (and hey, it has that exact editing time stamp).

But... even if it did say 2.2, it's a wiki. Edited by random people no better at knowing what's happening than anybody else. Without any sources listed.

If you're getting that from somewhere else, link away, but the word "believed" should have been a pretty big tip-off regardless.