No, I think they wrote it in a bit of a confusing way. Notice if you add all the times up you get a 60 min boil....So they're saying do this, then this etc.
Normally, you'd see the hop schedule written more like this:
2 oz. Columbus bittering hops (60 min)
1 oz flavoring hops (20 min)
1 oz aroma hop (5 min)