Thank you all for the information! I zoomed in on one of the Craftsy photos, and it appears the sample quilt appliques were machine sewn with a straight stitch a little ways in from the edge. When the time comes, I will try stitching through some of the excess fusible trimmings to see how hard it is to push the needle through.
It appears I misspoke in calling this a Jinny Beyer pattern. The fabrics are by Jinny Beyer, but the pattern says, 'A Project House 360 Quilt Pattern' and is credited to Christine Stainbrook. There is no class with the pattern (and the pattern directions seem rather minimal, yikes). It would seem that the fusible applique kit was optional and was originally sold separately, but Craftsy included it with the kit in their sale.