There is a typo within the man page of pacemaker-fenced page, as shown below:

       pcmk_host_list = string []

           Eg. node1,node2,node3

           A list of machines controlled by this device (Optional unless pcmk_host_list=static-list)

       pcmk_host_check = string [dynamic-list]

           How to determine which machines are controlled by the device.

           Allowed values: dynamic-list (query the device via the 'list' command), static-list (check the pcmk_host_list attribute), status (query the device via the 'status' command), none (assume every device can fence every machine)

I believe it should be reading:

(Optional unless pcmk_host_check=static-list) instead of pcmk_host_list

1. pacemakerd --version

Pacemaker 2.1.6-10.1.el9_3

Written by Andrew Beekhof and the Pacemaker project contributors

It is also seen under 

pcs stonith describe fence_ipmilan