I suppose it is a question or a suggestion to think about. There are no rules he gives. Christians are different. I do prostrate ever so often, but not as a rule. He may, but I think that is a rather strange point.
Any bodily direction is fine as long as the direction of the heart is right.
Praying to Jerusalem is certainly okay, but any other direction is just as okay. If it helps anybody to direct the body to a regular direction, go for it. Certainly, European churches should be in Europe and anywhere else people should build culturally appropriate buildings. Goldsmith is speculating here. This is not a book of instructions but a list of thoughts for others to pick up and think about further.