Biber on aarch64 is available

[Karl Berry]

    I reached https://tug.org/pipermail/tex-live/2022-April/047999.html
    ...
    Hope to see biber present in texlive.

As I explained in the message you cited above, someone (you, if you're
up for doing it) will need to contact Phil (maybe a submission at
https://github.com/plk/biber/issues is easest), offer the binary, and
arrange for it to get onto CTAN.  (I'm not sure of Phil's process for that.)

Then, and only then, will a new biber binary appear in TL.

Glad you were able to build it, in any case. --best, karl.