The data he is citing is from a public forum where anyone can contribute data. It is not verified in any way. This is like saying Boaty McBoatface is hiding under your bed, so, grain of salt.
I myself have purchased tickets for a Trump event that I had no interest in or intention of attending. This is a tactic that is easy to employ, but when a politician cites it to incite a reaction – well, good night, and good luck.