I don't think this paper you provided is similar to the setup of Tom's experiment 1c. It uses entangled photons and polarizers. The polarizer doesn't detect the photon at the slit, it only "marks" it, so in theory you can measure its polarizarion later and learn the wich way info.
A detector is anything that interacts with or changes the particles. There is no Detector, TM
of one kind only that is used in every experiment. The key in any experiment is which path information. They demonstrate that the quarter wave plates at the slits act as which path detectors by destroying interference. When in place they cause the photon to only travel through one slit (wave function collapse). That's what detectors are supposed to do.... detect the path of a particle. If that doesn't qualify as a detector I don't know what does.
To say that the QWP is not a detector because it only "marks" the photon instead of "detecting" it seems more of a semantics game than anything else.
Do you know any paper that has a similar setup as the one below? Where you can detect the particle passing through the slit? This would be ideal.
The quarter wave plates act as detectors at the slits. The only difference in Tom's is his detectors record directly somehow. However the setup in the two slit eraser records which path info (destroying the photon....Supposedly an irreversible process) from QWP'S at Ds, then later erases that info. Same concept as Tom's.