Please update "AddonSelector" again. I've updated it today to version 2.21 and it's using the UI narrator now, not the chat narrator anymore!
The UI narrator is way more effective and reliable as the chat narrator often did not, or if then very delayed, narrated the addon names
I'm switching LibAddonMenu-2.0 narration to this mode too.
Edit:
Switched LAM 2.0 to this UI narrator too now and will test it, then send you the file here as attachment again.