Agree with Paul it would move a small amount with moisture changes in the soil however it is still a solid foundation and suitable for a pier in my opinion.
The changes would be gradual and occur over time.....it's just a matter of checking your alignment/levels every few months.
.....from experience I can say concrete footings move as well.....I had a pole concreted in the ground right next to a house I once owned, it would gradually get closer/further away from house through each season.
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