Torque interval prescriptions over constrained?

I am doing low cadence intervals simply because I live in a flat area and I’m going to be going somewhere with steep climbs later this summer. So I want to get conditioned somewhat to lower cadences. I don’t ordinarily do these intervals. But when I’ve been looking at what coaches say about them, I’ve noticed a lot of them overconstrain the prescriptions. Ie. They will say ride 5x4min at 40-50 RPM, 80% FTP, 0.9-1.1 nM/kg. Is there a reason for this I’m missing or is this simply a mistake?