That connection then, the post holder to the post, will provide nearly zero strength against the post falling over. Unless there is a very long sleeve that runs over the post, like several feet, the lateral strength of the system is ruined abd all you get is vertical strength. I didn't plan on concrete backfill, just the footing cookie under the pole but the engineering was very certain that it was required. More than one structural engineer since I got three bids. To be fair, my location must design for 115 mph wind loads and the building is 30x60 so a lot of exposure on the big side with not much width.