This is the first time I hear about using IR converted camera for weddings! It's mostly used for landscapes. I doubt he really did this as that would be a bit insane. He probably just used photoshop to do it. A few Photoshop plug-ins can achieve similar effect.
On the other hand, you should have looked at his portfolio if he has similar images in there, then that's his style and he was under impression this is what you hired him for. All of us have different styles and are known for it.
If he doesn't anything similar on his website, you can approach him and tell them that what he gave you is different from the examples on his website. The more experience the photographer, the more consistent are the images. When photographers first start out, they tend to try many things to see what works for them. Sometimes this can be dangerous because weddings are not the best time to try new things.
Good luck!