It's a 12" square and the points definitely go right to the edge, no seam allowance. I followed the directions (what little there were) to a tee and if I stitch everything up (which I haven't done yet, I'm still laying out) my points will go to the edge. I don't understand why it was written up like this.
The directions are not for flying geese but instead to make squares 2 3/8", cut on the diagonal and then sew a light backgound triangle to each side of a dark triangle. I'm going to try to figure out the right dimensions to make these as flying geese and I guess I'll also have to recut the other edge pieces. I have enough fabric but it may cut into one of my borders and/or the backing. No big deal, it could be a lot worse, though I sure hope the inside dimensions aren't messed up.
These are the correct directions, I think my other link may have just shown a pic, not the actual directions.
https://www.patchworksquare.com/mf/s...uilt-block.pdf