Yes, but this is a different method. Using the encrypted books downloaded by the app for PC viewing.

Right now they use an old version of the app though, that can easily be blocked by Amazon. I'm surprised it wasn't.

The good thing about the download option on the web was that some older Kindles don't support any newer DRM methods so it would always work.

It's partially blocked. The old version of Kindle for PC won't let you download books published after Jan. 2023.