Not sure I follow, having added and upgraded numerous cars with aftermarket kits, I'm not sure what the problem is you're pointing to. If Mopar is coming with a kit then they wouldn't want to open the computer, they'd work with a vendor, like Paxton or Vortech, assuming we're talking centrifugal so it can fit under the hood and deliver a curved boost for better traction, exclusively in developing a kit. This is the way other manufacturers do it. Then they sell the packaged solution turn key with a dealer install option, done. Smog legal and certified and warranted, just like other manufacturers. I would not expect SRT to open the computer to the aftermarket unless they weren't going to do a kit, in that case, offer a licensing deal to SRT for access to the code and you can provide aftermarket kits and tuning, but again for other cars these are mostly all smog legal and certified, not off-road use only. Only tuner kits fit that bill and aren't the prime products being hucked out there. I don't think SRT would try to reinvent the wheel here, just do what others have done. A 640hp gen5 with a paxton setup IMO would conservatively be a 750hp kit and be hugely safe and emissions legal. If they did a tuner kit you'd be talking another 100hp at least and then kiss emissions good bye.
If a 750hp gen5 couldn't sell .. then, let's see what I could bet, I'd, I'd, go buy a corvette as punishment for being wrong. lol (not much of a punishment considering really)
What lovely speculation we get into though, if only, if only ...