He is half correct. If this was a "pro stitched" or whatever they call it order that they outsourced or did in house, then a mistake like this would be a big deal for that kind of product.
If this was an Indonesian made Premium jersey, he is factually correct. They are made in the same factories as Adidas were. I can tell you 100 percent, Adidas had similar QC issues. Obviously, there is no way for me to know if there are more or less issues with Fanatics - but it is the same factory that has had the same issues in the past. IE, if you ever buy a pre-customized jersey, always open the sealed bag before gifting it, you may be in for a surprise when your jersey is a different player, or blank entirely. (Adidas or Fanatics)