How to fix
/etc/vmware/hostd/vmInventory.xml
vi /etc/vmware/hostd/vmInventory.xml
(remove the lines for the virrtual machine)
/etc/init.d/hostd restart
References
Inaccessible virtual machines are named as Unknown VM (2172)
https://kb.vmware.com/s/article/2172
Restarting the Management agents in ESXi (1003490)
https://kb.vmware.com/s/article/1003490