Clarification needed for the Dropbox desktop application on Mac OS 10.13

Hi.

On July 13th, I received an email from Dropbox (my emphasis):

Starting in July 2025, Dropbox will begin limiting support for macOS 10.13–10.15. 
Unless you update your OS, this means you’ll be switched to a lighter version of the Dropbox desktop app at that time. You’ll still have access to core features like syncing and sharing files, but some advanced desktop options will no longer be available...

I have been a paying customer of Dropbox since 2013. I use several old Macs running macOS 10.13 High Sierra.

When I click the Dropbox icon in my menu bar (as of August 13th), my Macs are now showing a message:

Dropbox is limiting support for macOS 10.13-10.15
To keep the full capabilities of Dropbox, upgrade to macOS 11 (Big Sur) or newer – or access your files via web or mobile.
Learn more

The "Learn more" link goes to https://help.dropbox.com/installs/computer-os-not-supported. This includes (my emphasis):

We regularly release new versions... Periodically, we'll end support of the Dropbox desktop app for these operating systems. If you're running an older version of an operating system, you may receive an email notification from Dropbox explaining that it's no longer supported.
...
What happens to my Dropbox account when Dropbox no longer supports my computer's operating system?
... The Dropbox desktop app will stop syncing changes to your files and folders.

Note the large inconsistency between the email and help document.

At the moment, sync seems to be working for me. But would you please clarify:

1. Have I been "switched to a lighter version of the Dropbox desktop app", as the July email explained?
2. The help document suggests that Dropbox will end support for sync. However it gives no details about which operating systems are affected. Is Dropbox planning to drop sync support on macOS 10.13?
3. If support is to be dropped, can I please have a rough timeline. Are we talking days, weeks, months or years?

I'm disappointed at this lack of care in communication from Dropbox over this core feature.