Thanks for confirming. To be clear, I don't support removing the instructions from the Wiki. In my watching Android-IA / Celadon over the years, stuff that gets removed, people jump to the conclusion there is no interest or need.
For anyone in the community bringing up hardware, this is a rather critical need. Android is not Fuchsia, and nobody in the community is going to work on it without a traditional bootloader.
I think this should get flagged as a critical bug and the bootloader team should fix it, ASAP with priority. GRUB should always just work.