Interesting for sure
But first of all, lets wait till his ideas get completed, published and given feedback by different physicists. So far seems he's yet "working on it" it seems.
Secondly, since when is Einstein's theories "nonsense that we've been fed"? A huge number of experiments (and practical applications) have shown Einstein's equations and ideas to be correct so far (or rather a good enough model for the moment), with many predictions that are confirmed. It serves to observe, analyse and put in practice several experiments regarding our world and universe.
Also, remember you are talking about science, it is a basis of science that things should be open to being disproven and changed, but this doesnt make what came before as 'nonsense'. For example Newtonian physics isnt nonsense, it can serve to explain pretty well things that go on in a simple level (for example explaining simple forces on earth), and you can still use the formulas for making useful calculations here on earth, but when you start talking about massive values and planetary movements, then the innacuracies will become obvious.
So if science is about to be updated by a 12 year old, great, but from another article I read it seems he wants to state an 'expanded version' of Einstein's theory, not completely refute it. So he would be building his breakthroguh thanks to the work of another genius who came before him, who has also build his breakthrough on the work of other genius and so on (and probably if that kid is right, someone else will come after him at some point and build more on top.. ).
Lets see how this turns out, of course any real change in science is very exciting
