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What is the point of submitting a page like this with no content if there isn't an archive.is or some other archive page that can be linked to

Paywalled content is not unusual here, a non-paywall may appear slightly later.

And Kent is a fairly inspirational character, so those who are familiar with his work may be grateful for a notification.

And it's a free sign up, not a paywall, if you won't wait for an archivist.

Presumably folks who want to subscribe to this blog would already receive a notification in their email.