I have never heard of that before, but I am not saying they are wrong either. Almost everyone I know who keeps beardies uses treated wood, like drift wood is a popular one. Other people take outside tree branches, cut them up and bake them in the oven for a few minutes to kill any bugs hidden inside. Whatever you plan to use from outside, I would either bake it or use diluted bleach and dip it for a few seconds.
What works for me, and it might work for you, are hammocks and bricks. Bricks are dirt cheap and great for climbing and keeping the lizard's nails short. Beardies love hammocks. Those you can DIY or the 3 pack one sold in Amazon or Pet Supermarket works great for 40 gallon breeder or larger tank.
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