Yes, see post #1 of that thread, read carefully, follow the links it mentioned, ask questions.
RR USB interface is used by V7 tunetool independently of V7 scantool logging from the OBD-II port.
BBX = black box logging (BBL) of pids, black box flashing (BBF) to PCM, black ox reading (BBR) of tune from PCM.
PCM is like a carburetor/ignition system on hyper-steroids, it accomplishes the same thing in must finer/quicker detail... see posts #4 #2 #29 of this thread for a condensed summary:
https://forum.efilive.com/showthread...-Summary-Notes
PCM calculates cylinder airmass from MAF and/or VE, then it looks up how much fuel to add from various fueling tables (B3605, B3618) or from Closed Loop trimming, then it looks up IFR to calculate how long to spray injectors, it also looks up spark tables to set ignition timing based on cylinder airmass... we'll guide you thru it.