I first heard about this at least a decade ago, I believe it was debunked back then. But.. I guess I dont really care.
Helium Diffusion in Zircons
The authors argue that by extrapolating data on the rate of helium diffusion in minerals, the high concentration of helium in zircons can only be explained by a young earth. However, the data presented were taken in conditions of laboratory vacuum and actual diffusion rates in field conditions are known to be considerably lower, by as much as a factor of one thousand or more. The RATE researchers claim to have meticulously accounted for all crystallographic features. However, the diffusion rate of noble gases in minerals is so complex both theoretically and experimentally that helium concentrations are not considered by geochronologists to be reliable for any dating implications.
https://www.asa3.org/ASA/education/origins/rate-ri.htm