While the statistical argument does undermine the claim that the data show that the 2 fireballs originated from outside our solar system, the statistical uncertainty works in both directions. It is also possible that uncertainties in measurements of velocity and altitude could lead to fireballs that actually have origins outside our solar system to appear to have originated inside our solar system.
So, this is far from conclusive proof - in either direction.
As for particles being able to survive the atmospheric braking process, I doubt that we have models adequate to prove, considering the uncertainties, that nothing but vapor results.
So, I would encourage continuing efforts to look for remnants of fireballs that might be from sources beyond our solar system.
Regarding the conflicting claims for the analyses of the spherules that Loeb found and attributed to sources outside our solar system, I would like to see some of the data and logic, not just conflicting statements by different analysts.
The bottom line is that we do believe that objects whose origin is outside our solar system are currently inside our solar system, so checking on possible examples seems to be a normal scientific endeavor. The determination of whether we have found something of extrasolar origin should be based on what the analyses of the object indicate.
So, please, let's see an article on that.
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