From the Script Ad Hoc Group: https://www.unicode.org/L2/L2021/21016-script-adhoc-rept.pdf

"A project to digitize Cistercian manuscripts at Western Michigan University is not requesting the characters be in Unicode, so this is just an informational document. [...] We recommend the UTC make the following disposition: Notes this document (L2/20-290) but takes no further action."

For something to be added to Unicode, someone actually has to request it and shepherd it through the process.