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The article is unfortunaly not correct. The statement below should be corrected:

"You would need to configure the physical cable on the physical switch as a VLAN Trunk Protocol (VTP) port"

Besides that it naturally is not the physical cable, but the physical port that should be configured, the main problem is that VTP is not supported on ESX/ESXi. VTP is a Cisco proprietary protocol to exchange VLAN config between Cisco switches. What should be configured here is to make the switchport carry tagged VLANs, which on Cisco switched is called a "trunk port" (which is not the same as VTP).