The problem is “scientists” counting ice layers as years when they should be counting them as snowstorms...
And which qualified scientist told you they were misinterpreting their data?
Just think about it logically -- the accumulation of snow and ice in polar regions can be observed, it does not have to be guessed or interpreted.
Scientists can measure annual accumulations of ice, and record the breaks between winter and summer each year.
They can then count down through the ice layers, marking where each year ends, and the next begins, and noting how the ice compresses over time, making the distance from one year to the next shorter and shorter the deeper and deeper into the ice they bore.
So tell us virmintman, at which point in this process, according to your scientifically qualified source, did those doing the actual work become confused, and began mistaking different snow storms for the annual summer break?