This article is so full of ****.
I worked in the radio dept of a music marketing firm in Nashville. It's all about who you know. We had a budget allocated for taking radio directors out to fancy dinners. Flying them to our offices in LA, NY, Miami or Nashville and putting them in ridiculous hotels with spas. Paying for them to go to shows and stuffing them full of alcohol. We just generally wanted to get these people on our side. It was desperate.
When you have artists who are already big and established, it's probably a matter of the artists agreeing to do something in return. As long as a direct money transaction doesn't exist.
...and it really doesn't stop there. It included label execs if we wanted them to convince an artists' publishing company to come down on fees. It happened with managers if we wanted artists to do events. It was basically anyone who was though to be able to give us an edge to get spins.