Someone from NI can probably confirm but I suspect that bottom link is just out of date.
PXI used to run Pharlap for their real-time OS which is listed there. But now that is deprecated and they run LinuxRT. I would be surprised if this wasn't supported.
James Mc
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CLA and cRIO Fanatic
My writings on LabVIEW Development are at devs.wiresmithtech.com