And you are absolutely right.
Part of the problem is that people got hung up over the "wiretap" terminology, which is as obsolete as talking about dialing a phone. But people still use those terms even though phones don't have dials, and capturing phone calls doesn't require some agent to creep into a phone closet with clip leads and a tape recorder. And when a captured call is between an office in the Trump Tower and some other location, as some of those calls surely were, does it even matter where the "tap" was? Or, for that matter, the physical location of a server that might have been hacked?
An inherent problem with Twitter is the severe length limitation which forces the user to abbreviate his thoughts, and that often introduces distortion. I am not saying that Trump shouldn't use Twitter, but I agree that he does need to be more careful when he does.
Seems to me he was being unusually careful that time, using quote marks so that readers would not take "wires tapped" too literally. Unfortunately a lot of people don't seem familiar with that usage.