Yes, that is a method of creating 4 HSTs from 2 squares. You have hit upon the issue: bias edges. Many people don't have an issue with this, but I'm not one of them! You can create the same HST, by looking at the FINISHED block (all sewn into the quilt) and figuring out the size of the HST in that block. Cut 2 squares 1" larger than the finished size. Draw a diagonal line, then sew 1/4" on either side of the line, then cut on the line. Open, press then trim down too the finished size +1/2" for seam allowance. This makes 2 HST, so you will need to cut twice as many squares as the pattern indicates because the craftsy method yields 4.
so lets say the HST in the finished block measures 5". Cut two 6" squares, sew, press then trim down to 5 1/2".