No, the Lexar CFexpress Type B Professional Gold 128GB is not compatible with the Sony FX30.
Sony FX30 takes CFexpress Type A cards only (or SD) -- per Sony's own Help Guide, CFexpress Type B memory cards cannot be used. Lexar Professional Gold is Type B, a different physical form factor that does not seat in the FX30's slots.
What works instead
See all compatible memory card for the Lexar CFexpress Type B Professional Gold 128GB →“CFexpress Type B memory cards cannot be used.”
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Confidence: inferred