It's Henke's attempt to rebut Humphries. And he doesn't seem to have relevant data to prove his point about pressure invalidating the data on zircons. All he has is some experimentation with argon, which is not helium, and mica, which is much softer and more porous than zircon, and wet experiment as opposed to dry. Ask him for a valid comparison of data in rebuttal, not me.
Cordially,
You are seriously misrepresenting a rather long article.
When someone asserts something as absurd as a 6000 year old earth, they at least need to know something about the type of rocks they are testing.