You cannot deploy the NI 986x C series modules beneath an FPGA target in a LabVIEW project.
However, on some CompactRIO targets, the 986x C series modules require an FPGA VI to be deployed to provide proper XNET support for themselves. This is the reason why the C Series Module Compatibility Chart
indicates FPGA support for the NI 986x modules.
To do so, the cRIO/FPGA chassis has to be in hybrid mode for proper use. The correct setup steps for an NI-986x module are described in the Getting Started with CompactRIO
section of the NI-XNET Manual.
Refer to the Supported platforms for XNET C Series modules
section of the Readme for your version of NI-XNET
to determine if an FPGA bitfile is necessary for your cRIO target.