I doubt a child as gifted as this would have a "normal" time spent with other children of the same age.
Being smart can be isolating, either from not being able to relate to people or act normal, or people assuming you are arrogant, or developing actual arrogance, but in the scheme if things this is just one of many issues that affect people, and not necessarily that serious. The super-smart shy people I know are not too different from the average intelligence shy people I know.
Social skills can be taught. From reading individuals, to reading a crowd, to speaking with the proper poise for a certain scenario... these skills are directly teachable. We don't have to rely on hoping that they'll be re-invented by every child who happens to find themselves in an appropriate circumstance.
I'd suggest a renaissance style education, of the sort given to those in the gentleman's class. Teach science, teach maths, teach memorisation and the such, but also directly teach children how to function in society and how to grease its wheels to suit their desires.
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If you read through the whole article he is so so smart I don't think college will really challenge him. He is probably smarter than all the professors there. He seems like he is good at reading so he can probably teach himself most of the stuff. He already has a lot of AP credits. He can probably finish college in 2 or 3 years. Being 15 and having a degree from an ivy league school is pretty good.
That is not a good perspective to go into a learning experience with. I hope he does not arrive with that expectation.
While I agree that Ivy league is a nice signalling indicator, it is also a very strong networking environment. I've been offered jobs from former school-mates, received funding from another, and started my first company with yet another. I think that it will be difficult to socialize when you are just 12. A great deal of networking is at parties and events that 12 year olds might feel out of place in.
But I wish him luck.
Hopefully he'll have time outside university for socialising.