I think you have to take those lists that dr. Ruf provides with a grain of salt. Our homeschool GT co-op will allow admittance if you are doing work 3 years beyond grade level. Dr. Ruf works with a very particular clientele that tends to see GT evidence very early. It has a lot to do with speed of learning and intensity and not necessarily everything about what a kid knows. I consider my kid level 4ish even though he didn't hit the reading milestones on that list. He did hit all the math ones (some in level 5 too). And he could conceptually understand and explain the plumbing and heating systems in our house. He also conceptually understood a lot of science and advanced very quickly in piano after he started. By the end of kindergarten, he had caught up with many kids that read much earlier than him. Preschoolers can be widely varying in their interests. So if the lists work for you child, great! But maybe your child did something else equally intense that isn't on that particular skill list.
So I will agree with Kriston and say you are in denial!

You must have a very smart cookie to get those scores!