The "miracle pills" work by preventing you from eating garbage. They don't magically make you lose weight; they make you lose appetite, and also (as I understand it) get super sick if you eat garbage.
Fun fact: this side effect can become permanent, even if you stop taking the drug!
Can induce. We don't know "the precise prevalence of gastroparesis caused by semaglutide," though we know it's "unusual" [1].