Huge amounts of Font code

Alright. Are there still reports of "other fonts" being loaded?

I have not changed the settings. I'm just highlighting what the settings were. If I enable CF APO, the issue will reappear

Well, that's the only font from GeneratePress.

As mentioned by Ying, you can try checking other plugins if they are loading fonts as well. Perhaps you can try #1 here: https://docs.generatepress.com/article/debugging-tips/

It would be good to back up your site before doing so.

I'll take a look at it. I used the same plugins mostly for years. I used to use Thrive Themes and didn't have the font-face issue. It seems to have reared it's head since I moved to GP last year

Yes, that would be a good idea.

Basically, Fonts loaded by GP are from the ones you set in Appearance > Customize > Typography. Other fonts loaded are most likely not from GP.

If you have GenerateBlocks, and you load a font for any GB Block, you need to unload it too to be sure.