I think again some issues are being mixed up here.
People take callouts from RA and calculate a rate of descent (wchich doesn't make much sense). Anyway, rising terrain is already included in this calls, so they didn't have to increase their rate, just the closing rate increased. Then, after coming to this rate of descent, people again say - "increasing rate of descent and rising terrain" - so they in fact insert the rising terrain twice into the same equation.