Anyone know if the Pixel deals on Google Fi combine?

I just got an email saying I could trade in my Pixel 9 Pro XL for $600 and then that there was also a $450 discount for upgrading while on a Fi plan. If those stack...it's basically almost the entire cost of a pixel 10 pro XL. But maybe there's some fine print somewhere to where only one of these deals applies (and I just haven't found it yet). Wondering if people know?