In Emacs30, loading this mode will bring up this message about defadvice being obsolete.
../../opt/homebrew/share/emacs/site-lisp/asymptote/asy-mode.el: Warning: ‘defadvice’ is an obsolete macro (as of 30.1); use ‘advice-add’ or ‘define-advice’ [5 times]
It doesn't causes any problem except a warning on startup, so it is not urgent.
Edit:
I tried to fix it, but they all related to a mode that I don't use -> two-mode-mode
There is a dedicated page about the migration.
https://www.gnu.org/software/emacs/manual/html_node/elisp/Porting-Old-Advice.html
Edit2:
In fact, there is no canonical source for the two-mode-mode on internet anymore. Maybe deleting them are for better.