IMO, no since 250.94 only requires the means of intersystem bonding termination be installed near the service equipment or grounding electrode conductor for the purpose of intersystem bonding, not that the systems actually be connected to it.
Because each service provider has their own internal standards for grounding and bonding of their systems and equipment, which may differ substantially from the minimum requirements of the NEC, if the EC changes or alters it and doesn’t do it to the provider companies standard, he may be liable in the event of damage to the system or equipment and possibly even the building.
I feel that the service providers should be notified by the property owner and/or the EC that the grounding and bonding for their systems may need to be updated after a service change is completed.
