I think a phone call can be better for resolving a conflict because it allows a more rapid back and forth, you can adapt in real time to how the other person is responding. If someone gets upset about some word choice like here, you can quickly say "I'm sorry I didn't mean it like that" and get back to the actual topic over how the work should be organized instead of some superficial detail.

In the end it may boil down to some strong hatred for AI, this seems to be very common recently and "I prohibit to use all my translation as learning data for SUMO bot and AIs" certainly points that way. If that is the root cause then it may be impossible to resolve to the satisfaction of both sides.