These are kinda statistics about his average damage output. Note that his actual damage against Squishies will be much lower than these because they’re smaller than a training bot, and they’ll be moving…
He has one of, if not the worst damage profile in the game (amongst those whom it make sense to compare with, so like not Winston/Rein/Moira).
While statistics sites aren’t 100% accurate, it’s not like they’re going to say Bastion has a 1% pickrate when he actually has a 90%… they can give a general idea, but not absolute exact numbers.