Can m2 Mac mini downgrade to run Monterey?

The M2 Mac Mini was introduced in 2023 refer to following link Mac mini (2023) - Technical Specifications (CA)

macOS 13 Ventura was released by Apple October 24, 2022

As other have already mentioned - Not Possible

Generally, a Mac cannot downgrade to an OS earlier the one with which it was first released.

Absolutely not because M2 Macs do not ship with Monterey and the older operating system lacks hardware support for the new M2 devices.