Not even remotely close to true. The Surface Pro is a full-fledged computer running the full-fledged Windows; you can install all desktop Windows software on it.
An iPad is an iPhone with a larger screen that just runs mobile apps on a mobile operating system. There is a VERY big difference to any working professional that actually uses one or the other for real work. Microsoft should rightfully be annoyed, since they're the only entity in existence that has made a real computer with respectable horsepower the size of a tablet.