ISO6760-Q1: ISO6760 SPI Max Data Rate

Hello Sir,

In the ISO67xx data-sheet it's max. data rate is 50MHz.But the propogation delay is 11ns.
What is the max. SPI speed when i use ISO67xx as an isolator.If i use it with 12.5Mbit SPI Do you think it works without problem?

Thanks in advance
Best Regards