But is that single sided?
See Height limitations when using double-sided SSD for Primary Storage
there is no compatibility for double sided M.2 2230 SSDs in the Secondary Storage slot.
And if you are going to use both slots, Framework recommends single sided SSDs for both slots to avoid clearance problems.
Otherwise, if you want to use a double-sided 2280, you need to know the bottom side and topside heights of your SSDs, which I do not see on Kioxia pdf.
And before someone asks, why the limitation, they tried to fit more but ran out of space
Framework Laptop 16 Deep Dive - Memory and Storage