After falling below 50% trying to reason them out, I went consistently for 'longer title' -- and rose to about 65% correct. Short of actually knowing the fields of study, or searching for the actual titles, there may be no better heuristic.
I tried 10 and got 9 right. I wouldn't claim to "actually know the fields of study", though I am a mathematician so there were a few where I was able to say "no, wait, that wouldn't make any sense" with reasonable confidence. I did see some mostly-syntactic giveaways other than too-short titles (in fact, I think the shorter titles were mostly the genuine ones for me), such as titles that begin "From ..." but don't have any corresponding "to"; titles with unrealistically long chains of "structure" -- "representations of X over Y-modules over Z over W over T" or whatever; overuse of "Towards ...".
They have a context-free grammar, which is translated by a Perl script into OCaml code which "is also fast, allowing the snarXiv to generate papers even more swiftly than your favorite python script, or Ed Witten in the 80’s."
I went 9 for 11, but the more interesting part is the breakdown on each title. The two I missed fooled 3 out of 3 and 12 out of 16 respectively, and a few of the ones I got right, (nearly) everyone got right.
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They have a context-free grammar, which is translated by a Perl script into OCaml code which "is also fast, allowing the snarXiv to generate papers even more swiftly than your favorite python script, or Ed Witten in the 80’s."