https://youtu.be/6bVG7HABdls
The video’s main argument is that the Book of Mormon was probably written on a very specific copper alloy which allowed from 300-600 individual plates upon which the Book of Mormon text could be written. It points to a paper by Jerry Grover in which he gives 3 scenarios:
1) 600 highly polished plates weighing 99 pounds.
2) Same as 1 but with 30% void space weighing 80lbs
3) Same as 1 but with 50% voice space weighing 58lbs
4) 300 thicker plates weighing 54lbs
This lightest case is 10lbs heavier than the "Heroic weight" prop that Dan Peterson had made for Witnesses. Also, notably, the prop that DCP made doesn't have anything close to 300 plates:
DCP wrote:Knowing that filming the scene of Joseph running with the plates would require several hours, Paul Wuthrich was presented with the option of going with something lighter as a prop. He opted to use the two prop sets of plates that metallurgist Dave Baird had created, based on Baird’s careful research. Somewhat amusingly, one set came to be called the “non-hero set.” They weighed somewhere between thirty (30) and thirty-five (35) pounds. We’re more certain of the weight of the other set — unsurprisingly labeled the “hero set” — because Russell Richins weighed them himself. They came in at forty-five (45) pounds. In other words, at roughly the weight of the historical plates themselves.
https://vimeo.com/824199556/ecefc622ed
(11 minutes 16 seconds into the film)
But after all of this - the plates must have weighed more than they've ever been depicted and must have had many more leaves than ever depicted - the seer stone makes it all meaningless. Joseph Smith wasn't translating. In many cases he was writing down words that wouldn't have been created until hundreds of years later. With Early Modern English (Early Modern English) that wouldn't come about until many hundreds of years after the plates were supposedly carved. And then once Joseph was done not translating, the plates were themselves physically translated by some magic means back to Kolob.
Mormon apologetics is an absolute mess, and all they can do is try to hide each issue in a tiny box to isolate it from the larger picture that shows just how ridiculous it all is.