It's not exactly irrelevant when you brought up repair time and alternative transportation.
I feel like you didn't read your own article. The AC on the train doesn't really factor into their warning.
They advised people to avoid the train to avoid congestion of the system because trains travel slower when the rails heat up.
They advised people to defer car travel because roads will be more congested due to heat causing mechanical issues in car engines. They also said if you don't have ac that it could be actively dangerous.
Listing a big list of cons for one and then saying the other one doesn't have them really makes it seem like a comparison, particularly when it doesn't seem like an equally applied standard.