That's a selective quote. I'm talking about being able to get files on and off the device.
That notwithstanding, looking at the page you link, let's look at each heading and what it says.
Google Drive, Dropbox, and OneDrive integration
https://support.remarkable.com/s/article/Integrating-with-Go...
"Step 1: Log in to my.remarkable.com and click the menu in the top right-hand corner."
Handwriting conversion
https://support.remarkable.com/s/article/Convert-handwritten...
"You need to be connected to a Wi-Fi network and logged into a reMarkable account (my.remarkable.com) in order to use handwriting conversion."
Read on reMarkable
Chrome:
https://support.remarkable.com/s/article/Read-on-reMarkable-...
"You’ll also need a reMarkable account to use this feature."
Microsoft Office:
https://support.remarkable.com/s/article/Read-on-reMarkable-...
"8. Log in with your reMarkable account."
Screen Share
https://support.remarkable.com/s/article/Screen-Share
"Your reMarkable needs to be paired with the cloud"
Send by email
https://support.remarkable.com/s/article/Send-by-email
"Note: You must be connected to Wi-Fi to share files from your reMarkable. You won’t see an option to send a file if you’re not connected to Wi-Fi and signed into an account."
Tags
https://support.remarkable.com/s/article/Tags
You can tag pages without a cloud account. It's useful but at best an anciliary feature.
Limited cloud sync
https://support.remarkable.com/s/article/Connect
You need an account.