Yes, the Canon EOS R5 Mark II is compatible with the Lexar CFexpress Type B Professional Gold 128GB.
Lexar CFexpress Type B Gold writes at 1500 MB/s, well above Canon R5 Mark II's 90 MB/s (Video Speed Class V90) 4K120 floor. Highest-performing card in this category.
“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