Sure, but this isn't a back&forth interview - it's a blog post. The author could have included a section with clarifying questions they expect the candidate to

Sure, but this isn't a back&forth interview - it's a blog post. The author could have included a section with clarifying questions they expect the candidate to ask, and responses to those questions. As it stands, we still don't know why the server was broken in this way and why they created a work around in the client instead of fixing the server.