Basically, it's totalled.
It can be fixed right. Completely stripped, disinfected, scrubbed, all soft part interior parts replaced.... there is a procedure to disinfect the HVAC ducting.... but realistically do you think a dealer is going to do that? You will never get that smell out of that car. It can be done, I've seen it done... but I highly doubt flat rate dealer techs are going to take the time and care it takes to do it right. Strip car, clean everything, replace anthing fabric/foam, reassemble car.... notgonnahappen.com. What will happen... Dealer throws new carpet in, sprays a little lysol in the HVAC... then months from now you will still be dealing with rank odors that just keep getting worse.
I'd tell them two words. New car.