@jo Hi there,
To my eye the Unauthorized library looks rather abandoned, I'm not sure if the source code is on Github or elsewhere but a quick search didn't turn up anything promising. There are a bunch of other Pd-Extended era libraries that are similarly unmaintained.
There is a version in Deken (Help menu -> Find externals) called:
I think libraries with that "v0-0extended" name were taken directly from one of the final versions of Pd_Extended, and if there is no more recent version, that's a likely sign that the library is unmaintained. Since Darwin-x86_64-32 is listed, it seems your only option for using these objects is to run Pd with Rosetta 2 (Intel emulation) and reinstall the library with Deken. I also recently migrated from Intel to M2, and since my patch is dependent on a whole bunch of abandoned libraries, I'm currently running everything in Intel mode. It'd be great to have more native Apple Silicon versions of older libraries, if enough savvy Mac users are able to find the source code repos & compile updated versions.
As for those specific objects you mentioned, I haven't used either, so unfortunately I don't have a good recommendation for replacements.