Hardly an independent panel.
Why? Because they're academics? Unless you have a specific reason to find them other than independent, you're committing the logical fallacy of poisoning the well.
they did say he was incorrect to not have real statisticians working on the results - which invalidates much of the published work.
That's incorrect. The conclusions are in no way automatically invalidated because a statistician was not working on the results. Non-statisticians do statistical analysis of data all the time, and produce valid results. This is not to say that statisticians should not review the analysis for problems, but to say the results are automatically invalid is stupid.
And isn't that what really matters here, that the scientific method is carefully applied instead of fitting data to a pre-concieved conclusion?
No, what matters here is if the conclusions from the analysis of the data are validly drawn. Science works to find support for theories, which are pre-conceived. Let me repeat that - having something you'd like to show by experiment and analysis is key to science.
It's funny that you seem so willing to accuse Mann of doing sloppy work, given the clear biases in your own thinking about the matter.