1st off-- right now it's "unavailable " on their website --- also I didnt see any specifications to state if the suppressor is integral or not- but it appears to be a qd mount.
Therefore it is 2 separate items-- a suppressor that must go through the nfa, and a separate sbr that also must go through the nfa regs.( due to the 13 inch barrel )
you would need 2 separate tax stamps/fees--- if the suppressor is non removable therefore considered "integral" than its a single stamp item because if it's a permanently attached MD it counts towards the overall barrel length and would no longer be an sbr.
On sigs web page the part number does say "sbr" so I assume it would be classified an an nfa sbr--- I do not see anything saying that the suppressor is included though-- just a suppressor in the pic. Do you have info that says the suppressor is included ?