I can find a website that says martians live among us here on Earth. Or that eating 15 pomegranates a day will cure pancreatic cancer. Or that every computer in the world will crash on January 1st of 2000 and the whole world will fall into complete chaos.
Doesn't make any of it true.
Second point: 2x4 feet is larger than a 50 gallon terrarium. A 50 would be 18 inches by 48 inches. So this website where you found this is full of all sorts of incorrect info. Either a 2x4 or a 50 gallon tank will work well for starting a hatchling. Either is way too small for an adult.
