I was agreeing with you, and adding that even if you have a Twitter account, you would still be likely to miss an update to the tutorial among the author's other Twitter posts.

It seems that the author added a way to get notified by email, which might work for you: https://type-level-typescript.com/03-objects-and-records

Personally I set a crontab to alert me if the next chapter page's size increases above 50kB.