Hi @Brian2659
Yes, a Co-Host can read the notes.
Sadly, the old software showed Calendar Notes beautifully right on the calendar itself. Now the only way to see a note (or even know if there is one) is by clicking a date with a black dot (indicates note), then go to the right panel and scroll down to private note. Then click that to read it. I agree that many of the Airbnb Help articles are not always "helpful", have outdated information or simply don't exisit. It would be very beneficial if they would add screen shots to the text in the Help articles also. As far as I know, I don't remember seeing any Help articles on the change with Calendar Notes; it just happened overnight and Hosts were left scrambling. Many had used screenshots of the Calendar with notes to send to cleaners, etc. That is not possible now.
The calendar and notes were totally changed in Summer 2023 release and this caused alot of headaches for Hosts (and still does). The suggestion was to add a "Show Notes" layer for the calendar, but alas, that has not been done. The other issue is once a date has passed, you can no longer access the note on the Calendar. You will have to go to the Reservation Details to read it. What a pain! Also the calendar used to indicate a booking from another platform, but that is not the case anymore.