Update, just about a year later:
Sincerest thanks Benjamin M., as your discovery above is still the only solution I could find--in Ventura now-- to get Resolve working w/ my DeckLink card and enable (fix) Desktop Video Setup.
But, to get BACK function w/ Premiere Pro, After Effects, & Final Cut Pro, I had to make this change (going back and doing this instead of what you did):
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sudo cp -R /Library/Application\ Support/Blackmagic\ Design/Blackmagic\ DeckLink/Signed\ Extensions/BlackmagicIO.kext /Library/Extensions/BlackmagicIO.kext
...that is, COPY rather than move the extension, so there are two copies total, each in a different folder (note you need the "-R" for "recursive", as kexts are technically directories not files).
I really, really didn't want to have duplicates of that kext. But I tried using a symbolic link instead, and no go. This was the only way that worked. I currently have the setup app recognizing the DeckLink 4K; and Resolve, Premiere, FCP, & AE outputting to it.