Yes, the Lexar CFexpress Type B Professional Gold 128GB is compatible with the Panasonic LUMIX GH7.
Panasonic LUMIX GH7's Slot 1 accepts CFexpress Type B cards directly. Lexar CFexpress Type B Professional Gold 128GB is VPG400 class. Clears: Motion pictures (72 Mbps, no CFexpress class rating required); Motion pictures (200 Mbps, no CFexpress class rating required); Motion pictures (400 Mbps, no CFexpress class rating required); Motion pictures (600 Mbps, no CFexpress class rating required). Above 600Mbps -- including variable frame rate with ALL-Intra and internal ProRes/ProRes RAW recording -- Panasonic's own spec states these require a CFexpress card; no SD card of any class can record them. Panasonic's own text never gates any GH7 CFexpress-side mode -- including this top tier -- behind a specific VPG rating, so this card (rated VPG400) clears every recording mode this camera supports.
“Motion pictures with 72Mbps or less: CFexpress card, SD memory card with SD Speed Class with Class 10 or Video Speed Class 10 or higher Motion pictures with 200Mbps or less: CFexpress card, SD memory card with UHS-I / UHS-II UHS Speed Class 3 (U3) or Video Speed Class 30 or higher Motion pictures with 400Mbps or less: CFexpress card, SD memory card with Video Speed Class 60 or higher Motion pictures with 600Mbps or less: CFexpress card, SD memory card with Video Speed Class 90 Motion pictures with 800Mbps or more, variable frame rate with ALL-Intra, or ProRes: CFexpress card”
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Compatibility inferred from spec rule (citations above are manufacturer-verified)