If there's several locations that refer to installing a grounding conductor to the street side of a water main, is this considered an auxiliary grounding electrode?
For instance I see this connection for IT room grounding buss bars that call for a direct location to the water main.
It is not an auxiliary electrode if it's something like the water main that already exists and is required to be used as an electrode for the premises power supply.
Systems that aren't the premises power supply (e.g. IT equipment) shouldn't be calling for connection to a specific electrode like the water main. They should simply call for connection to the 'premises grounding electrode system'. You should interpret the water main requirement as meaning the same.
Last but hardly least, there should be something called an 'intersystem bonding termination' for the premises, for all these other systems that are not the main power supply but that call for connection to ground. See 250.94 for requirements. Many residences don't have this installed but in a facility that has an IT room you would hope that those who installed and inspected the service did it right. Terminals should be provided for all these systems that require connection to ground, and that's where all these systems that call for grounding connections should be connected.