I'm betting someone does indeed know the contents of those conversations, but that sort of thing if it exists poses a problem, because it's going to be compartmented up the wazoo.
Still, I can't really think of any reason for these Trump officials to have been in contact with the people they were in contact with that doesn't at the very least call into question their wisdom and understanding of political and diplomatic reality. So at the least they are stupid, or they are mendacious, one or the other. Neither is good, though perhaps only one is truly actionable.
Pretty much rule one of talking with a foreign power, if you are in a position of power, is to assume the other guy is an agent. Most of the time, even if he or she isn't directly in the employ of the security services, what you say is going to get back to the security services. It's pretty elemental tradecraft.