"Not" should be before "to be".
E.g. "It appears not to be working."
"Or" appears to be wrong here. It sounds as if he is either incompetent or unprepared.
If you use "to be" use "and" to say that you mean both.
If you use "not to be" use "nor" for the same reason.
And I'd use the past simple tense here if you mean one particular meeting.
Or I'