I think it is quite likely you are piloting your Plane-of-Truth without an adequate parachute.
The only relevant body of information regarding "earth's rotation variations" is the one regarding the Milankovitch Cycles. There are at least 3 separate cycles that create a net affect, with the dominant pattern being 100,000 year modulations: in the last 800,000 years, there have been eight major Ice Ages.
Since we have an ice core database that extends beyond 100,000 years, but not beyond 200,000 years, I am pretty skeptical that the Milankovitch Cycles are causing that much disruption to the data. In fact, what the M. Cycles did was create a net pattern of data that the ice cores recorded and present to scientists.
There was one glaciation in the last 100,000 years, with the glacial buildup ... and then inevitable melt down... reflected in the arctic ice cores.
The term "Ice Age" refers to the 800,000 bracket of time when "Glaciation and DeGlaciation" is in a regular cycle.
Within this 800,000 "Age of Ice", there are Glacial Periods, or AKA: "Last Glacial Maximum".
Here is a listing of how the terminology can be used:
 For the most recent period cooler than present but without significant glaciation, see Little Ice Age.
 For the full sequence of geologically recent glacial advances and retreats, see Quaternary glaciation.
("The Quaternary glaciation, also known as the Pleistocene glaciation or the current ice age, is a series of glacial
events separated by interglacial events during the Quaternary period from 2.58 Ma (million years ago) to present.")
 For the geological epoch often associated with or referred to as "The Ice Age", see Pleistocene.
(The whole Pleistocene was quite long: 2,588,000 to 11,700 years ago. This definition is based on a very different set of technical premises:
"Within a long-term ice age, individual pulses of cold climate are termed "glacial periods" (or alternatively "glacials" or "glaciations" or colloquially as "ice age"), and intermittent warm periods are called "interglacials". In the terminology of glaciology, ice age implies the presence of extensive ice sheets in both northern and southern hemispheres. By this definition, we are in an interglacial period—the Holocene—of the ice age. The ice age [using these understandings] began 2.6 million years ago at the start of the Pleistocene epoch, because the Greenland, Arctic, and Antarctic ice sheets still exist." )
 For a generic geological period of reduced temperature and increased glaciation, see Ice age
(see the note appended to  above).
 "Last glacial" redirects here. For the period of maximum glacier extent during this time, see Last Glacial Maximum
(the URL /wiki/Last_glacial_period ).
Let me know when you actually have the article with text saying what you say it said....