I’d just follow what it says in that doc.
Don’t think about whether you could have re-done the entire workout, but just the last interval.
I see what you’re saying here, where moderate says “an additional set of intervals” and hard says “an additional interval,” but just consider the last interval.
I think what’s described as a “set of intervals” refers to something like over/under workouts where the last set of intervals includes all of the overs and unders, rather than just the last interval (usually an over). Does that make sense?
The same could apply to other workouts that have sets.
I’ll let the team know that this has proven to be a bit confusing..