I'm not actually sure how recent this is. Clicking through the Wayback Machine for their FAQ (http://web.archive.org/web/20150813135145/https://www.haiku-...), it looks like they've shipped the 32-bit versions with both GCC 2 and a newer version since at least 2015, starting with GCC 4 and getting newer as the years passed.
It would explain, why I couldn't find that "how to build the toolchain" page anymore through some quick browsing and posted the Wikipedia reference instead. I guess somebody(TM) should update the Wikipedia page then.