Yes, the Angelbird AV PRO SD V90 128GB is compatible with the OM System OM-5.
Angelbird AV PRO SD V90 128GB is V90 class. Meets the floor for: 4K30 (30 MB/s floor). (Peak write 280 MB/s is not evidence of sustained performance; the V90 class rating above decides this.)
“OM System OM-5 product page: 4K 30p at up to 237 Mbps; UHS-II SD cards with sufficient write performance support all recording modes.”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)