Communications work has special design requirements, and this is where the EC has to follow the plans as designed, if he finds any condition, that appears improper, it is best to document the problem and submit it to the Engineer in charge for review, but don't make any changes on your own.
Common bus system for communications , may differ depending on the equipment configuration power requirements and frequency.
The engineers, that work in these fields know all the special requirements, and for him to comment that the engineers din't know jack about grounding din't help his cause, If he thought there was a problem with the grounding, he should have brought it to the engineers attention, and discussed it with him, not just make his own changes.