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Yes - the headline here is missing the important part:

"HEY’s UI is 100% HTML over the wire"

If there's Javascript on the site, then surely the JS code goes over the wire too?

I don't have an invite and can't check, but whenever the UI changes, it looks like the only possible effect is swapping the <body> tag out for a new one.

Obviously if JS is disabled, this will just navigate to a new URL and load an entirely new page.

But if JS is enabled and the new <body> tag does not contain any <script> tags, then the only thing going over the wire is HTML after the page loads the first time.

How can you replace just the body tag without some javascript to set the html and ajax to get the html?

And specifically instead of using a JSON API to get the data, and render it on the client. JS and CSS is still used, but for other things.

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