Architect Refuses To Move. What do I do?

I fucked up and my architect moved to this location. I want to move it one to the right (or one below, either works for me).

I've tried so much but can't get him to change positions at all. I had locked the corruption chamber and commander at the ends of their chains, as well as the smithy before the architect. My assumption was that he wants to move to tiles that don't border other tiles (i.e. either of the two positions I want him to move to)

But after running the architect he does not move. Am I doing something wrong? Do I have to place a restricted room? Was locking the smithy a mistake?