I think that piece of paper spreading FUD is a simple attempt by the IT department to minimize the number of people trying to charge their laptop off of an 10-18w cell phone charger and generating charging failure tickets in the system
Dell famously won't charge off anything less than 65w USB-C PD when turned on, and I think 30w when turned off. Apple will trickle charge when off, on 15w (standard phone charger) if the charger truly is USB-C PD compliant (about 50% of the time these days)
Given that most people don't own a 65W USB-C PD charger (yet) I can see the IT department adding warnings in an attempt to avoid confusion and reduce the amount of extra work.
That said, I've been using USB-C 65W chargers since the original Pixelbook came out + Nexus 5, and later Anker branded 65W chargers and I've never had any problems. I generally don't use off brand stuff though.
Dell famously won't charge off anything less than 65w USB-C PD when turned on, and I think 30w when turned off. Apple will trickle charge when off, on 15w (standard phone charger) if the charger truly is USB-C PD compliant (about 50% of the time these days)
Given that most people don't own a 65W USB-C PD charger (yet) I can see the IT department adding warnings in an attempt to avoid confusion and reduce the amount of extra work.
That said, I've been using USB-C 65W chargers since the original Pixelbook came out + Nexus 5, and later Anker branded 65W chargers and I've never had any problems. I generally don't use off brand stuff though.