No this was still inside of 2012, before the crack video.
The section starts: "But in mid-2012, just after I became chief of staff, Rob suddenly began paying for everything by check. His pocket cash seemed to have evaporated." -- That's a few months after the St Patrick's Day debacle. According to Towhey, then-chief of staff Amir Remtulla tried to get Rob to get help. "Amir said he’d spoken to Rob, and Rob had agreed to take some action. He wasn’t going to rehab, but he would see a counselor. I suggested we speak with Doug, and with Diane, Rob’s mom. Amir already had."
I think Diane cut off his money. Rather than admit what a mess he is and risk losing his powerful position, their way of getting him help is by making it harder for him to buy himself booze and drugs.