How? According to the article I linked in my later post below, the fonts in question aren’t visible in Font Book (and I didn’t see them).
EDIT: These are “Supplemental fonts” installed by mac OS.
They’re listed in this Apple Support document as " available for document support":
These fonts are available only in documents that already use the font, or in apps that request the font by name. Some are older fonts that were included with earlier versions of the Mac operating system or Apple apps.
The developer of Font Menu Cleaner says:
Some popular apps will fill their font menus with every font they can find on your computer.[…]
Unfortunately, these apps aren’t supposed to display these fonts. And often, there is no way to hide these fonts or remove them from the font menu.
I checked some other apps:
If I open the Fonts window in Apple Pages, it shows only Noto Sans JP (of the Noto fonts).
Sibelius Ultimate 2021.2 shows 6 of the Noto fonts.
Affinity Publisher 1.10.1 looks similar to Dorico, showing most if not all of the same Noto fonts.
@dspreadbury You don’t see these in your machines running Big Sur?