What is missing is comparing against other types of wood of same weight, some wood floor laminates, or the same food without treatment for example.

It looks like the wood after treatment is not much better than the same weight of plywood.

Testing Penetration With 30 Layers of Wood: 9mm vs. .357 Sig vs. .45ACP https://www.youtube.com/watch?v=j4EeZUPDaNc

How much wood will a 9mm bullet go through? https://www.youtube.com/watch?v=9A6ZLDEooEk (full metal jacket 9mm 115 grain is not going trough 4 inch plywood).

how many 2X4s does it take to stop a bullet? https://www.youtube.com/watch?v=1-rTvzHQa1Q (answer 4)