Assuming I understand what you mean by "people", then this comment sounds completely correct and contradicts your last comment.

Your last comment said person B could be sued for copyright infringement. But the essence of clean-room is that person B "hasn't seen the original work which means there can be no discussion of copying".

Person A is not giving the original documents to person B, they only give functional details.

One of your earlier comments had a vague description of clean-room that wasn't clear on this aspect. But you were responding to someone that gave a clear and correct definition, so I assumed you were also using the actual definition.

If you've actually been talking about fake not-really-clean-room then sure someone could get sued. But that's obvious. The suggestion by alightsoul was actual clean-room.