Patterns need to be vetted for clarity.
The pattern (and that of another sweater I recently bought) are difficult. I am had to re-do this sweater 6 times. (know that I am a seasoned knitter and crocheter with over 40 years experience) The one I'm working on now, I'm on my 10th try after almost finishing and ripping it out yet again. Instructions for patterns need to be tried and/or vetted before posting.