No way this is true. The park started work on Velocicoaster before Hagrids opened to the public.Just a anecdotal note- when I was at Islands of Adventure a couple weeks ago, then temps were in the 30’s. Hagrid’s was down about 2/12-3 hrs at the start of the day. The employee at the ride entrance with whom I ended up have a very long conversation with said that it’s a temperamental ride, doesn’t like the cold, and the day prior it finally opened up at 1:00pm from an 8am park opening. He mentioned that the park basically got Velocicoaster as reparations from Hagrid’s unreliability. (Paraphrasing what he said)
I hope Intamin fixed those temperamental bugs with Pantheon.
Also, before we freak out about the cold. Let's remember that this coaster is in Florida. It's rarely below 60° during the day. So there's a definitive difference between a ride that runs in the low temps almost never to one that will likely run in temps lower than that regularly. Especially if it's consistently low like it can be during CT/HOS.