An actual concern would be if this "backchannel" turned out to be messaging an insider who acts outside of policy. We know the Saudis and other state backed groups had insiders in Twitter at least, but I'm much less inclined to believe there are any pro-israel insiders in say, TikTok.
That former twitter employee was found guilty of acting as an agent of a foreign government. So far the Israeli lobby has a free pass to meddle in without triggering the same treatment. See https://www.justice.gov/opa/pr/former-twitter-employee-found...