Solution
Yes, the cRIO-PN-S module is compatible with the new cRIO-904x and cRIO-905x controllers. All you need to do is to make sure you downloaded the latest version of the cRIO PROFINET driver from the VI Package Manager. You can search for cRIO PN Device, it'll be the version 4.0.0.2, released by KUNBUS GmbH, as shown in the image below.
It's important to note that the cRIO-PN-S module
isn't directly compatible with the cRIO-904x/905x lines - it needs to be housed in an
Ethernet RIO Expansion Chassis set to slave mode, which is then in turn compatible with the cRIO-904x/905x lines. Essentially, you can communicate with the cRIO-PN-S module using a cRIO-904x/905x, but it must first be housed in a cRIO-9146/7/8/9 connected to a 904x/905x as a slave.