In most cases, I'd think those small teams support like a max of 5 ABIs, out of the 176.

Of course it's "possible". Of course, complaining about it won't get it done. But I can easily envision an alternate universe with the same OS & CPU architecture variety, that has the effort required for doing this be ten times smaller, and I don't see it being utterly pointless to ponder the viability of that if only just for fun (which the swearing in the article hints to me it is).

I, as an author of a small language implementation, would really prefer to not need to implement more than one C FFI ABI, much less 176. I'd meet somewhere in the middle, but 176? nah.