Does uBlock Origin even exist for Safari? If not, then I imagine it won't exist for this browser either, since it's just a wrapper around a macOS-provided, Safari-/WebKit-based webview.
> ..as of 2022, uBlock Origin’s extension is available for several of the most widely used browsers, including: Chrome, Chromium, Edge, Opera, Firefox and all Safari releases prior to 13.
Explanation of the state of uBlock Origin (and other blockers) for Safari - https://github.com/el1t/uBlock-Safari/issues/158
Apparently, the only WebKit-based browser that can run uBO is Orion browser (beta, Mac only).
If DDG wanted to they could replicate this work to allow for MV2 WebExtensions to be installed.