Yes, the Kingston Canvas React Plus V90 128GB is compatible with the Sony A7 IV.
Kingston Canvas React Plus V90 is Video Speed Class V90 (260 MB/s rated write). Sony A7 IV's SD slot requires Video Speed Class V90 or higher for its top XAVC S-I 4K (600Mbps) mode per Sony's own Help Guide -- this card meets that class requirement.
“XAVC S-I 4K 600Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher”
“leverages UHS-II Speed Class 3 (U3) and Video Speed Class 90 (V90) for peak performance”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)