Yeah, as a matter of definition, no R/T cars in '72. That's when they became rallye's, so its not an R/T.
What's the build date though? As super blue pointed out, some of the early '72 model year cars had leftover '71 parts. Like his car, my car (built 8/17/71) has quite a few '71 pieces on it (fuel tank, filler, gauges, etc). It would still be a Rallye, but some of that early documentation may list it as an R/T.
What does the rest of the fender tag say?