To the best of my recollection every RB211 built had the thrust reverser in the hi-bypass duct and never used the hot jet thrust. It would make no sense since virtually all the thrust came from the large fan.
It certainly was there when I was working on the reverse thrust interlock system and that was prior to first test flight.
I don't recall saying, or implying, that any RB211s had been built
without the cold-stream reverser, only that early engines had
both. References to the the hot-stream reverser survived in the engine Type Certificate up to 1982.