I believe mechanical devices includes physical restraining beds and devices, which WWASP used at Brightway Adolescent Hospital on a regular basis. Perhaps they're also reserving the right to taser or shock kids, or maybe that covers the right to have locks on isolation units such as the Hobbit at SCL or the dog cages at Casa by the Sea.
And that pizza analogy, geez. That guy needs a spokesperson' and really no WWASP head honchos should speak on camera. So in his words, they would fly to your state and home to pick up some raw dough and then cook it for awhile in Jamaica or the Midwest, and then send it back to you three years later cooked and you'd be like, oh, great, I paid $126,000.00 to get this crusty pizza. I'm totally in debt, even the pizza hates me, the brochure lied, and delivery took 2 years longer than promised. Total ignorance.