These observations were his first ones in 2023 and he didn't know that the object had already been in bright phase. I must doubt the reliability of his observations and don't import his data into my personal (not official) database from now on to prevent the propagation of errors (or "pseudo-data"). Please don't feel bad.

the intervals were 0.0007 day (I initially thought that they were spaced by 1 min, but were not; exactly 0.0007 day).

Turned out to be exactly 1 min.