I actually discussed this with scientists back in the early 1990’s and they thought it was all hogwash.
I explained how the field strength would decrease and why. This dipolar weakening of the earth field is caused by the alignment of the axis of the geographic North Pole and the Magnetic North Pole which represents the axis of the earth’s core.
This alignment creates a decrease in the dynamo effect of the core’s friction with the crust, acting similar to a electric magnet which creates our magnetosphere.
When I discussed this with astrophysicists who specialized in the polarity reversals of planets, they told me that the density of the earth protected us from the shift as the polar reversal that takes place on the sun every 11 years.
Excellent!
Every 1st-year geology student understands magnetic pole reversals.