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The article misses to mention the variation in distance from the sun, which are important to the Milankovitch cycles.
The orientation of the sun is what drives the Seasons (Spring, Summer, Fall, Winter).
But when it varies with distance, it creates a long term cycle.
This cycle is just one of the many cycles of the sun.

The solar activity also follows several long-term cycles.
This is well known, but always disregarded by climate alarmists
(never call them scientists, because they do not understand science).
And the solar activity is the big driver to a changing global climate,
and can give 50% change in energy.
This is called solar forcing, and solar particle forcing.
The particle forcing is the strongest driver, and is similar to holding your hand above a candle.

There are also longer solar cycles.
The ice-ages in the past, were likely caused when the solar system was
filled with galactic dust from one of the milky-way arms.

The differences in solar activity are also causing "climate change" on other planets.

Another factor is volcanic activity, and geothermal heat.
There are some variations in those, but less predictable as cycles.