Yes, the Sony A7 IV is compatible with the Sony Tough M 256GB CFexpress Type A.
Sony Tough M Type A writes at 700 MB/s. Sony A7 IV CFexpress Type A slot requires 200 MB/s for XAVC S-I 4K30. Clears by 500 MB/s. Same-brand pairing — Sony's recommended configuration.
“Sony A7 IV Help Guide: CFexpress Type A memory cards supported for all movie formats including XAVC S-I 4K at 600Mbps.”
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Confidence: inferred