AAAARGH! I'm not at all surprised, but NIST's excellent whitepaper on Inclusive Language (NIST.IR.8366) has been withdrawn:
https://nvlpubs.nist.gov/nistpubs/ir/2021/NIST.IR.8366.pdf
This was an excellent resource that I reference all the time. I feared it would go away so I made a snapshot a few weeks back that I uploaded here: https://nygren.org/archived/NIST.IR.8366.pdf