Hey there, I checked with the content manager and it sounds like there was a bit of a delay and the first item - Getting Started with Unity Web - should be released on October 17. The second item - “Unity Web for mobile browsers” has been delayed even more, I’m afraid, and doesn’t have a release date at the moment. We’ve updated the blog post to reflect this. Sorry for any confusion.
Unfortunately, it appears that future Unity Web learning content will be on indefinite delay. The subject matter experts that we had lined up to write these tutorials are no longer with the company. We are looking for someone else internally to write this content, but it will take some time.