That's correct, you can still qualify for an L-1 (as a transferee after 1 year of employment outside the US) even if you don't have a degree and there are TN occupations that don't require a degree. Further, you can get an O-1 without a degree as well as an H-1B as long as (in the H-1B context) you have the equivalent of a bachelor's degree (essentially 12 years of professional experience).