Tape drive multipath connect

Hi everyone,
I would like to hear your opinion.

4 node cluster and Tape-SAN environment.
Does Storage System in this KB mean Cluster? Or is it node (controller) ?

https://kb.netapp.com/Advice_and_Troubleshooting/Data_Protection_and_Security/ONTAP_Multi-path_support_for_NDMP_tape_backups

The technical case answer was Cluster.
If node1 and node2 connect the tape drive with single path, node3 and node4 cannot connect to the tape drive.
I can't believe.

So what does multipath mean in this KB?

I am confused.

Thanks