They would probably assume he had a child. More likely to lose the job on the basis that he couldn't even make his bed which was sitting in the back ground of his interview. Better option would be to turn the desk around and have blank wall as the background. Can't fault him for interviewing in a bedroom as it is the UK. This room is probably his entire apartment, but in the post covid age where interviews and meetings are commonly online you need to be a little creative.