I'm not sure I believe Politico anyway. But if true, It seems it would be courteous to ask Trump. What could it hurt? Unless he was going to run for Pres?
Courtesy is one way of looking at it, but running independently and winning on your own record is important too.
If I was DeSantis, if Trump volunteered his endorsement I would thank him, but I wouldn’t ask for it.
DeSantis wants to win reelection on his own merits.