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Dr. Greger reads that high blood pressure is the result of "disease-dysfunctional arteries", without explaining.

Dr. McDougall has said elsewhere that the body increases blood pressure as compensation, when arteries have been narrowed enough to restrict blood flow to vital organs. This would account for raising diastolic (the lower) blood pressure.

If arteries have become inflexible (hard), then there would be an increase in the normal increase of pressure, when the heart pushes a new pulse of blood into the arteries. This would account for raising systolic (the higher) blood pressure. (This is not from Dr. McDougall, it's just obvious. Flexible arteries can expand to absorb the pulses.)