Any form of URL is at best a point in time reference.
Shortened or not, they change, disappear, get redirected, all the time. There was once an idea that a URL was (or should be) a permanent reference, but to the extent that was ever true it's long in the past.
The closest thing we might have to that is an Internet Archive link.
Otherwise, don't cite URLs. Cite authors, titles, keywords, and dates, and maybe a search engine will turn up the document, if it exists at all.
Shortened or not, they change, disappear, get redirected, all the time. There was once an idea that a URL was (or should be) a permanent reference, but to the extent that was ever true it's long in the past.
The closest thing we might have to that is an Internet Archive link.
Otherwise, don't cite URLs. Cite authors, titles, keywords, and dates, and maybe a search engine will turn up the document, if it exists at all.