In order to evaluate ICR's findings, one must first establish a proper methodology for fission track dating and compare ICR's methodology and finding to previous results.
Fission tracks, as physical structures, are simply linear tracks in rock crystals usually about 10-6 meters long.
In order to make fission tracks a useful method to date the earth, it must fit the criteria of good a natural clock.
A note must be made that fission tracks are extremely thermally unstable (Geochronology Group 2005).
Overall, it appears the ICR research team was thorough and had solid scientific data, in the form of realistic ages with relatively small standard deviations, of the fission track dates for the rock samples which they collected.