I found an old thread where a Proxmox dev stated "Hi Every 10s seconds, we check the status of the NFS server with 'showmount' and then gather statistics about disk usage *if* 'showmount' successfull. We need to report early if a NFS server is down, hence the regular check.".
There doesn't seem to be an easy toggle or anything. I see some later threads about the issue with workarounds for FreeNAS. Ill see if I can gather info from those and apply it to Unraid. If that fails is there a command I can use on Unraid to disable all logs related to NFS?