These comments seem to say gravitational redshift experiments would only verify theories that obey the equivalence principle (ep), not specifically general relativity: https://arxiv.org/abs/0806.0528 (see 2nd paragraph p.16) and this (by one of the same authors) seems to show even the ep is not needed to explain the shift: https://arxiv.org/abs/gr-qc/0403082
But this paper (published in Nature, 2011): https://arxiv.org/abs/1109.6571 (see p.8 for key graph) says the TeVeS theory is "inadequate" based on gravitational redshift measurements. I only have a vague understanding of the ep and have not studied general relativity or TeVeS but I have read that TeVeS is meant to obey the ep. So do the "comments" and experimental paper not contradict each other? Should gravitational redshift be considered a central test of general relativity or the ep or neither?