https://wccftech.com/ipad-mini-6-no-mmwave-5g-support-with-cellular-option/

There are several features to look forward to on the newly announced iPad mini 6 but do not count on experiencing mmWave 5G speeds. This is because Apple does not provide such an option to customers.

Apple has currently limited mmWave 5G support to the iPhone 13, iPhone 12, and M1 iPad Pro series, and while you can experience sub-6GHz connectivity on the iPad mini 6, users cannot witness those unfathomable downlink and uplink speeds accompanied with those mmWave 5G networks. Fortunately, for consumers around the world, mmWave 5G support is not necessary as the iPad mini 6 supports more 5G bands than the iPhone 12 and M1 iPad Pro family, at least according to Apple.