Folks, complaining here about your specific model not getting an update isn't going to change anything. If your particular model hasn't received an update, you should contact Asus support instead. When you have like 50+ different models to develop, push through the QA team, and then release, things take time, and some models will get it before others.
As for the RT-AX86U, you foilks saw that it was the one the most severely impacted by the recent issues. Based on what I know and without going into details, I can say that Asus are probably working on something more complex than just providing a firmware with an updated AiCloud for this particular model. They haven't forgotten it, it's not being ignored either, it simply requires more work.
If you fear you might be vulnerable, then disable AiCloud and any WAN- exposed service outside of IPSEC/Wireguard/OpenVPN servers, and just wait it out.