I'm not to worried about compaction.
I'm assuming it's clay?
As long as the holes were dug a decent size, the soil would be plenty loosened around the trees.
By the time they've settled in and roots are venturing out into the compacted soil, I can't imagine it being a problem-
roots are incredibly powerful.
Many people say to mix
compost with the soil when filling in the hole around your tree.
I
never add compost to my planting holes;
aside from the organic matter breaking down and the tree ending up sinking (soil around trunk=collar rot=death in my experience)
making it rich and delicious in the hole makes it less attractive for the tree to stretch it's roots out into the compacted soil
and you also risk trees becoming rootbound if there's a major difference between the soil inside and out of the planting hole,
as the roots might keep going 'around' the hole and not 'out'.
That's one reason why it's recommended to dig tree holes square-the roots can't go round in a circle