Hi I'm one of the people cited by the article. Fraktur is awesome. I implemented it in my terminal. https://github.com/jart/cosmopolitan/blob/c6bbca55e9f977e386... Now that unicode makes it easy, there's no excuse not to have fraktur!
This isn't me being critical in what you've done though. More of an adjacent commentary about the state of ANSI escape sequences.
There's still plenty left on that list, though -- including at least one escape sequence I'm fairly certain was included as a joke (SPQR).
The functionality is legitimate (although I doubt anyone uses it), but the name is pure silliness -- much like the PowerPC "eieio" instruction.