If you go to their webpage you will find that the inspection contract, with the fine print, is not there. I am sure that what the fine print says, based on looking at other inspection contracts for vehicles and houses, is that anything the inspector misses becomes your problem, not his. They do not offer any guaranty as to the accuracy or completeness of the inspection.
Not saying that the inspector would not do a thorough inspection of the house portion, but the mechanical portion of the inspection , including engine, transmission, drive train, and suspension seems to be lacking.