Packages inside the system folder are not relevant for the things you do inside the site.
On the screenshot i don’t see that you are working inside the site folder and with the site user.
The prompt for working inside the OMD site should look like this.
OMD[sitename]:~$
If you are inside your site, then there is only “pip3” available no “pip”.
The used “pip” is something from the system itself.
It is strange as a normal CMK don’t install “python3-pip” as a dependency.
The only command i use, as a site user is
OMD[sitename]:~$ pip3 install redfish
After this you can check
OMD[sitename]:~$ python3 <-- should be 3.8.7 with your CMK version
“import redfish” should work now without problem for testing