Unless they unofficially slid it from their plans since April, yes its still in. "You will be able to attain the in-game currency and some RTPs in-game." https://www.eternalcrusade.com/news/445-State-Of-The-Crusade-III
Also this would apply to sidegrades. Just substitute the Apollo with that shoota. 10. Can you give us a comparison between two marines who want to use an apollo plasma gun? One who goes about buying it in the RTS and the other who goes out to get the in-game equivalent? BRENT ELLISON: The equivalent in-game won’t be called an “Apollo” and it will look different, but the base of the weapon has the same stats and effects. The main difference between ones purchased from the store and ones in-game is that with the Rogue Trader weapons you can quickly get what you want, but it will have some weapon mod slots pre-equipped that can’t be changed. The equivalent base that you earn in-game will have all its slots free, so while it will start off weaker you can customize it fully how you want. Obviously both can have equivalent stats when fully modded. - in forum community Q&A Answers Compilation Thread page 2 post #13. Causes more sound could be one of the weaknesses as that would reveal your position to farther enemies. The compensator barrel attachment in Planetside 2 does that, PS2 wikia of it here.
Literally wouldnt even worry about it till you get to see it in game and also see its ingame counterpart.
View: https://m.youtube.com/watch?v=EfltPEkNUjs go to 13.50 the wapon in the store have fuxed stat and not upgradable, other in game wewpon have better stat. TL; DR the store don't contain skin but useless junk weaker than the ingame item.