She knows she'll embarrass herself.
"Scheduling conflict" is like your wife having a headache so she can't have sex or when you "feel too sick" to go to school because you're playing hooky with friends instead.
Obviously you are going to not believe her and make up your own reason.
But you don't actually have a counter to "scheduling conflicts".
It's two weeks to the election and campaigning isn't done on the fly.
Rogan insists his show is hours long in his place.
So yeah, "scheduling conflicts" was always going to be a possibility.
What is Harris willing to cancel for Rogan?
Trump, as stated elsewhere, has been cancelling appearances all month.
So freeing his schedule up was probably much easier.
Unless Rogan comes out and says something different, "scheduling conflicts" is all we are going to get.