He is insinuating if the Draft is pushed back that inevitably Off-season programs, Training-Camp, and the start of the regular season would be delayed as a resulting effect of that; which I don't necessarily agree with depending on how delayed the Draft would be pushed back to.
Like mentioned the lack of the crowd or public viewing event isn't the issue, GMs and scouting departments feel they don't have the adequate "Medical" and "Psychological" evaluations of players enough to make the best educated decisions.