I'm not a driver, but two of the routes I used to load were training routes, and so I got to hear a lot of what went on.
Them lying to the new guy after DQing him about how no one else makes scratch there either is their way of placating you. I heard it repeatedly. And it was completely false. I knew drivers that would get it done and make bonus, pretty much every day.
They want you to stick around as a part timer, and then seasonal drive, so they told you a lie to make you feel like the problem wasn't you.