No binaries found in packagemanager when using M1 Mac (arm64)

I am testing the usage of Posit's pacakge manager as a substitue for MRAN and cannot find binaries for arm64 architecture on Posit, while I do find it both on CRAN and MRAN for the same date. Code below shows that source packages are found on packagemanager but not binaries, and that those binaries are available from mran and cran. This code runs fine in windows because those binaries are found, presumably it woud run also in Linux and older Mac, the problem is with arm64 binaries. #1 binarie...