If you read the blog post and the docs carefully, there is actually still a /v1 unauthenticated endpoint available just for oEmbed, however that requires you to follow redirects in the future.
Note that the URL above uses v1.1 of the API. This version requires authentication and offers more predictable rate limiting. In addition, v1 is also available; it does not require authentication, but you should support HTTP 302 redirects as this endpoint will eventually migrate to a new path.