That was my understanding as well. As discussed in the comments, SDs/IQs are just percentiles - ordinal, not cardinal -, so it's not obvious what 30 SDs would translate to. If Einstein is 15 SDS out, maybe 30 SDs just means you are a physics genius like him but also a little bit wittier than he was.
15 SDs out is less than 10^-50. There's only been about 10^11 people. In all probability Einstein wasn't even the smartest of them.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.