That is one hell of a theory.
Be aware however, such an attack could not be anonymous. Each nuclear weapon family has its own fingerprint. There is even a science dedicated to this, they call it Nuclear Forensics.
China knows this and probably wouldn't strike in this manner. Iran doesn't GAF, so they would.
I think this guy might be the originator of the “Nuke Sniffer Drone” theory:
https://x.com/MilaLovesJoe/status/1868042627360403849
Not only that, but post #19.