Python courses have disappeared?

I was working on some of the Microsoft Learn Python courses, and took a small break from last month, but was wanting to go back to the one's I'd bookmarked, but they seem to have disappeared? I even looked at one course I'd completed, and the link, https://dori-uw-1.kuma-moon.com/en-us/training/modules/python-object-oriented-programming/ , just redirects to https://dori-uw-1.kuma-moon.com/en-us/training/browse/ . It appears that the majority of Python courses has now gone, why?

(Apologies regarding tag, but there's nothing obvious for either Microsoft Learn, or Python)