That rule of thumb is for car tires at ~30-psi. At about 100-psi, the rule of thumb would be that 10 degrees F corresponds to a 3-psi change in pressure. It's a ratio thing.

Not that it makes a difference to what you're saying. Although tire blow-off is not uncommon for decenders who brake a lot, especially tandem teams, but the temperatures involved there are a lot higher than hot asphalt.