Yes, the Nextorage NX-A2PRO 160GB CFexpress Type A is compatible with the Sony Alpha A9 III.
Nextorage NX-A2PRO 160GB CFexpress Type A is VPG800 class. Clears: XAVC S HD (100 Mbps, no CFexpress class rating required); XAVC HS 4K (280 Mbps, requires VPG200); XAVC S 4K (280 Mbps, requires VPG200); XAVC S-I 4K (600 Mbps, requires VPG200); XAVC S-I HD (222 Mbps, requires VPG200).
“NX-A2PRO Series |CFexpress™4.0 Type A MemoryCard VPG800 VPG400”
“XAVC HS 4K 280Mbps CFexpress Type A memory card (VPG200 or higher)”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)