Yea, even when reading their supported HDD's section alone makes me concerning as to whether or not I can even boot it up.
But it's not like I must be able to run it, I just like to have an alternative ready to go just in case Linux, Linux-libre, Hurd, FreeBSD, and OpenBSD all one day fall.
OpenBSD is something I the least expect to fall considering it's made by a dedicated team who seem to understand the majority of how hostile the internet in current year is, though they then fall flat on the timezone stuff where they use Goolag and Cuckflare.

And Haiku from what I understood has a more similar file structure to things like DOS, Windblows NT, OS/2, and ReactOS, which just feels way too alien to me.