Yeah, I'm using the exact command line arguments from the docs that I
linked to. All three of the following (from that link) work as
expected in 2.22:
lilypond -dbackend=eps -dno-gs-load-fonts -dinclude-eps-fonts myfile.ly
lilypond -dbackend=eps -dno-gs-load-fonts -dinclude-eps-fonts --png myfile.ly
lilypond -dbackend=eps -dno-gs-load-fonts -dinclude-eps-fonts
-dpixmap-format=pngalpha --png myfile.ly
If it's a command-line option issue, I guess it would just need a
quick change in the docs to bring them up to date.