I don't think the concern here is about whether you freeze your quilts or not. Not many people I know of do that...
What I think is the concern is the reaction of the chemical ink to both heat and cold. If it can be completely washed out, there should be no concern. But, if that chemical residue remains in the fabric, it could cause problems in the quilt down the road.
Your great-great grandchild may cherish that quilt you made beyond your imagining and it would be a shame for some old chemical residue left in it to be eating away at the fibers and utimately destroying it.