That's my thinking. I assume they figured that because the account they were "chatting as" was so close, it might help. Or they thought it had a dot initially and found out they were wrong when the rep said there were no orders.

Amazon lets you chat without signing in and you can claim to have any email address you want at that point, so it's tricky to say if this was intentional (hoping the reps were "dot blind") or if it was just a mistake/bad initial guess.