if your model doesn’t have these screws, it’s probably ok to just skip this step. at least that’s what i did on model gt-p7500, and that repair was successful (battery replacement). Janine, a friend asked me to fix his Tab where that had happened when he tried to replace the battery himself… i just took out the 3 big cables over the battery, and re-inserted them, and that fixed the problem. you should try that if you haven’t already..
Warning: there may be adhesive keeping the SSD in place. i got 1 with, and 1 without, both slightly different models (but still the same model name, A1466 )