According to this [1], the alleged takeover you mention not only didn't involve Adrien or Denis Carikli, it also happened in 2021, two years before the creation of https://libreboot.at, which seems to be from 2023, and GNU Boot, that succeeded libreboot.at [2]
[1] https://web.archive.org/web/20210331005023/https://libreboot... or https://www.andrewrobbins.info/libreboot.html if you want a third-party
[2] https://lists.nongnu.org/archive/html/libreboot-devel/2023-0...
Either way, it seems that if there was any problem around the usage of the GNU Boot name, it was solved by adding disclaimers galore: http://notgnuboot.vimuser.org/
To me the disclaimers above show enough good faith. Meanwhile https://libreboot.at continues up. I don't think we should be that harsh and accusatory to someone after they actually comply with the request of changing a page name and adding disclaimers.