This is correct I'm testing it out now.
The colorful button on bottom left is for video boost or doing ai stuff like changing sky to sunset etc that is all cloud related stuff and would need internet connection and cloud.
Magic eraser, best take, unblur etc doesn't need internet connection.

Make sure to keep google services on in the sandbox because I just tried without it and half those features crash without it. Can disable it after doing your edits.
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Are you able to use the pixel camera without Google photos on grapheneos?
I think so but you just can't open the preview in Google camera without google photos. Install both and cut internet connection for both is what I did.
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