A tour credit typed into a profile is a claim. Anyone can type anything.
Where ATOM has its own record of the tour, it says so. Credits now carry one of two labels:
Verified by ATOM: ATOM's own tour records back this one.
Self-reported: entered by that person. ATOM has no record either way.
BOTH STAY VISIBLE, AND BOTH COUNT. A credit from 2014, long before ATOM existed, is real history and is not worth less. It is simply not ours to vouch for, and saying so honestly is the entire point.
ATOM will not invent a verification it does not have. If a credit is not labelled verified, that means ATOM has no record, not that the person is lying.