For cases that are being addressed under the school's non-Title IX sexual misconduct policy, the expectation would be that yes, in most schools, acts committed by university employees off-campus would be covered under the school's policy. Employees would encompass various parties at the school be it professors, adjuncts, tenure professors, teaching assistants, athletic staff, coaches. Whatever the case may be, if an employee commits an alleged act of sexual misconduct, sexual harassment, whatever the case may be off-campus, at most schools, the expectation would be that the school would be adjudicating or would be pursuing such a case against the accused party.
I've helped many school employees over the years. Many times, say, acts may take place over breaks or over summer vacation for example, and a college employee may be of the mindset that that would not apply. Unfortunately, that's not the case in many instances. It's very important that when an accused party faces such a situation that they have an experienced attorney advisor that can help best navigate the process for them and can also help protect their interests from as early as possible in the process.