There may be good arguments against the project – traffic and parking, certainly – but arguing that letting the soccer team use the stadium is equivalent to selling off public land to private ownership seems like such a stretch that it undermines their whole position. They’re not getting exclusive use, and they’re helping pay for the renovation.
As an EV driver, I’m fine with this – the fee is cheap, and I value public charging for the convenience much more than for the cost avoidance.