That's not a Rebel. It does not have the Bilstein shocks or skid plates. Doesn't the Rebel also come standard with an e-locker? And as mentioned it has ventilated seats, which are not available in a Rebel. Add to that the fact that it doesn't have the Rebel grille tells me it's not a Rebel.
My '21 Warlock doesn't have any Warlock badging, not on the bedside or the hood stripe, no skid plates, and no off-road terrain package. It still is a Warlock.
Deciding what is available or not on a vehicle doesn't guarantee one thing or another in some cases. I tried "building" my truck exactly as it is optioned (trailer control, wheels, etc.) on FCA's site and it is not possible for me to get everything that is on my truck selected on the site as it actually is in reality. The only way to select the trailer brake controller from the site means also selecting at a minimum the $895 "trailer-tow group" option, but that has the different mirrors. I also have the class 4 hitch that comes on the "trailer and traction" group but not on the trailer-tow group, but I do not have the limited slip rear-end (I asked the dealer to check one time). I have the trailer hitch, and the trailer brake controller in the cab, but any tralier/tow option that I have comes with a different design mirror, according to the site. The truck does have one of the Warlock option codes on it on the original window sticker, 26W I think.
"Officially", the insurance lists it as a 2021 SLT/Warlock. By some people's logic, that means my truck is an SLT, not a Warlock. I have the "Rebel" moustache grill, does that mean my Warlock is actually a Rebel? Not at all. Lots of Ram trucks out there have that style, but it is predominantly on the Rebel.
Point is, judging by "this is only available on X" from the site does not exactly set in stone that yes or no, he (or she) has a Rebel.
Now, if it is in fact not a Rebel, and the dealer sold it as one, they need to be talked to about that. I believe it falls under "false advertising". Private citizens have been doing the "badge it as the expensive option" and trying to scam people that way, like in the '60s and '70s GTOs. They take a stock LeMans and put GTO badges on it, and suddenly you have a wildly sought after GTO. Doesn't mean it's a GTO, even though they started out as an option on the LeMans. Is that legal? Not for me to decide. Is it ethical? Hell no! But when a private citizen does it is not as bad as if a dealer is doing it.
With one caveat. There is such a thing as dealer installed options. So, if the dealer was the one that changed the stuff, then strictly speaking, it is "authorized", as long as it is an FCA dealer that did it.