The basis to demand a test (beside to test E=mc2) is my theory and I explained in the first reply of this thread how I think this experiment should be done.I don't think anyone is suggesting it is "perfect" or need "no further testing" - rather, the point is, you need to have some basis to demand a new test, as well as an idea as to what that test is.
In counterpoint - are you suggesting E=mc^2 is flawed?
The experiment I proposed will test if E=mc2 is flawed.