Yes, the Nikon Z30 is compatible with the Transcend 700S V90 128GB.
Nikon Z30 uses a UHS-I SD slot with a 4K30 codec floor of 30 MB/s. Transcend 700S V90 is UHS-II (V90, 250 MB/s write) — runs in backward-compatible UHS-I mode at ~100 MB/s effective. Clears the 30 MB/s codec floor by a wide margin.
“Nikon Z30 specifications: storage media is SD and UHS-I compliant SDHC and SDXC memory cards. UHS-II SD cards operate in UHS-I mode in this slot.”
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Confidence: inferred