I, too, side with Joseph (not that he needs my backing).
For someone to come out of the blue, malign, vilify,cast doubt, skepticism at a minhag, for some sloppy “research”, is beyond arrogance. Chutzpa is a better word.
If you (that’s BIG YOU), don’t know, keep your distance. And shush up!
Has that “mechaber” gone though the all seforim that deal with it. Has he been at the time “we adapted it from the pagans”? Again, if it’s not your minhag, keep your respectful distance. And kindly keep your mouth firmly shut.