Yes, the Canon EOS R5 Mark II is compatible with the Delkin Devices POWER CFexpress Type B 128GB.
Delkin POWER CFexpress Type B writes at 1700 MB/s, far clearing Canon R5 Mark II's 90 MB/s (Video Speed Class V90) requirement for 4K120.
“Canon EOS R5 Mark II Compatible Cards: CFexpress Type-B compatible; cards for movie recording should support VPG400 per Canon online manual.”
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Confidence: inferred