I'm not seeing the measurements you think you are getting. I'm seeing the bag's measurememts as 33x17x11.5 with no other options. Another hint is the capacity is listed as 6452 cubic inches.
That size bag is enormous! It wouldn't qualify as carry-on for any airline. I checked several other vendors for it and the size specs are the same on all of them for this bag. The Tote-a-Ton name of the bag is also a hint.
Search for Samsonite tote a ton and you will be able to see the same things I saw. BTW, the added total linear dimension for this bag is almost at the maximum size for checked bags on Spirit. See the link below.
You need to search for carry on luggage and pay attention to the full measurements, including the wheels and handle if that's the kind of bag you want. If you go to a store to look at luggage, be sure to take a measuring tape. The bags will often tout their small size, but they are not counting wheels and handle.
This link to Spirit's requirements has good details and illustrations. The size you have in your question appears to be for personal items through April 3rd after which two of the dimensions change. As with most super discount airlines, it looks like how they make some of their money is by nickel and diming passengers on things you'd expect to be covered in the ticket price.