I don’t understand this statement, you proved this is not the case.
on your miniPC:
dietpi@DietPi:~$ ls /mnt/Toshiba/dietpi_userdata/
bazarr docker-data downloads filebrowser homeassistant lidarr_downloads mysql Video
deluge downloaded emby-backup home IPTV mnt unnamed.png
the mounted nfs share on laptop:
ls /mnt/nfs_Toshiba/
IPTV bazarr docker-data downloads filebrowser homeassistant mnt unnamed.png
Video deluge downloaded emby-backup home lidarr_downloads mysql
Or did you mean the stats are wrong, since they show the same as for the other drive? (size, used, avail etc?)
What are the actual stats for this 2 drives?
Is it maybe the case that these stats show the numbers for the whole miniPC system and not for the particular drives?