Yes, the DJI Mic Mini is compatible with the Nikon Z30.
Nikon Z30 has a native 3.5mm audio input (confirmed on Nikon's own online manual). DJI Mic Mini ships with a 3.5mm TRS camera cable, which plugs directly into that input -- no adapter needed.
“Audio input Stereo mini-pin jack (3.5 mm diameter; plug-in power supported)”
“DJI Mic Mini Camera Audio Cable (3.5mm TRS) × 1 DJI Mic Mini Mobile Phone Adapter (Type-C) × 1”
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