... Because the 32GB version is by no means an SDXC card, but (as discussed below in the description to see a SDHC UHS-I (U3) card. It allows _not_ video recordings with XAVC-S in a Sony RX100M3, although they significantly faster than the SDXC compatible Kokurrenz SanDisk.
Who benütigt an SDXC card to 64GB version should grab (available here in the description SDXC UHS-I (U3)).