I wrote the post and object to the argument that it primarily covers GnuPG issues.

But stipulate that it does, and riddle me this: what's the point? You can use Sequoia set up for "modern crypto including AEAD", yes, but now you're not compatible with the rest of the installed base of PGP.

If you're going to surrender compatibility, why on Earth would you continue to use OpenPGP, a design mired in 1990s decisions that no cryptography engineer on the planet endorses?