The only alternative I've found is
M-: ( i n f o " ( e g l o t ) " ) RET
which isn't really very user friendly.
* lisp/progmodes/eglot.el (eglot-manual): Unobsolete.
* doc/misc/eglot.texi (Top): Mention M-x eglot-manual.
* etc/EGLOT-NEWS: Mention unobsoletion.