What’s the score with Page Builder on M2 Open Source?

Can anyone clarify what the deal is with getting the Magento Page Builder on M2 Open Source (2.4.2p2 if it makes a difference)There’s an article here from a Magento senior director in July this year stating that

we will be making Page Builder available to all our merchants, across both Adobe Commerce and Magento Open Source. With this change, merchants who start on Magento Open Source benefit from Page Builder’s easy-to-use WYSIWYG content authoring

https://magento.com/blog/magento-news/bringing-page-builder-content-authoring-magento-open-source-community

And I can see that in our install, we have a vendor/magento/module-page-builder directory, but there’s no sign of it. What are we missing? Is it available or not?

thanks,

James