Do you think they would have had the same success if they were D1? Regardless, it's a great accomplishment!
Most years no. There are better teams in D1. Look no further than Alter's results against Elder, Moe, and X in any given year to see how they might fair if they were in D1. That's not a knock on them, but usually D1 is deeper. They could definitely compete and even advance to State, but outside of a year here or year there they wouldn't be winning championships, definitely not consistently.