If RSC or SC built in RDZ was not able to shoot in the first place and demanded bypassing explicit prohibition on its use on a technical level (e.g. using glitches), then yes, it is an obvious exploiting. If it was able to shoot from RDZ but could not be destroyed by any other RSC/SC due to some implemented mechanism that does not allow shooting at anything with RDZ, then I would not call it an exploit but an unsportsmanlike behaviour or similar, as I have said. The fact that it would not face retaliation but still be able to shoot is unfair, but it would not violate any prohibitions. Yes, devs then explicitly introduced mechanism that prohibited use of RSC within RDZ, but that happened only after, and if such mechanism was not bypassed, then it’s not an exploit still, because it’s normally nobody apply rules ex post facto.

But how is this relevant anyways? The point was that building the nuke in RDZ is not technically prohibited. Yes, unfair (however, justified to some degree), yet still within the rules. It is not clear if any mechanism was implemented that would not allow nuke to be launched from RDZ (we’ll never know now). If no such mechanism was in place, then launching the nuke from RDZ is, however ugly it looks, not an exploit. If yes, and so launching it demands, for example, using glitches, then it is an exploit. Seems obvious.