Yes, the Lexar Professional 2000x 128GB SD UHS-II is compatible with the Sony A7 IV.
Sony A7 IV Slot 2 accepts SD UHS-II cards. Lexar Professional 2000x 128GB SD UHS-II is V90-class certified, meeting the A7 IV's most demanding SD requirement (XAVC S-I 4K 600Mbps needs V90) -- compatible for every SD recording mode.
“XAVC S-I 4K 600Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)