While I agree with the general thought about the interview, the last example question has nothing to do with riddles and falls into a completely different categ

While I agree with the general thought about the interview, the last example question has nothing to do with riddles and falls into a completely different category: designing with constraints. In a job where a significant part of your responsibility is figuring out how a feature should work, and balancing that with a variety of obligations (accessibility, security, resources, what partner teams need), asking a question like 'how would you modify a bicycle to make it suitable for the blind?' is a reasonable way to see a person's approach to working through various aspects of a design and weighing different features without relying purely on domain knowledge of a specific area of software.