That install line came from the installation instructions, so you’re definitely on the right path.
It seems like something went wrong in installation. You are getting errors related to BLAS, which is a linear algebra acceleration library used by numpy and scipy, as well as PyMC. If you had previously installed PyMC directly into your base environment, I’d completely uninstall conda, reinstall conda, then reinstall pymc into a new environment. It’s never recommended to install anything into the base env.
Given how exotic your error is, I’d do this regardless.
One other thing; you can avoid switching the kernel in Jupyter by activating the relevant environment before you launch notebook.