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Well, what we mean by "on the same network" maybe more complicated then it sounds if a device has multiple network interfaces and a non-trivial routing such as any modern smartphone that smartly switches between wifi and cell. It's plausible that various apps and devices have a different behaviour which network they treat as local/standard.
However, I just tried it out with two Samsung Androids. One is a hotspot and has no other wifi. The other one uses the hotspot (and no other wifi obviously). Then lauching pairdrop, they can "see each other" (through broadcast packages I assume) on the local network. During testing the hotspot device had internet access through 5G, so both devices could reach paridrop.net, but I believe, this is not needed while in local network mode. At least the file transfer itself should not go through the internet in this mode.
I had similar a similar experience with syncthing. Sure, the hotspot is a hack and neither super reliable nor super fast on most phones, but at least my phone does not seem to block access from/to the hotspot device.