Other mistake: In one of the beginning scenes, the time at the bottom says that it is 22:00, which means it would be 10pm in China. In the scene, it is bright daylight, not night time as it should be. (00:02:15)
Other mistake: In the deli's basement, Wheelie shows places on a map of America where Seekers are hiding. Agent Simmons states that the closest is in Washington D.C., but the closest marked on the map is in the middle of New Jersey, near Philadelphia.
Chosen answer: He knows from stories passed down to him from older generations of bots, not much unlike stories about the past passed down to us from our ancestors. His line about no one telling him anything is just a way to avoid being put back in the box or being tortured by Mikayla.
dablues7