it's not true, they just need enough heat to properly digest. the easiest way to achieve proper hot-spot temps is with belly heat (UTH), but it's not the only way to accomplish a proper hot-spot temp, like JodanOrNoDan mentioned above.
Thanks! Also,I wanted to say I love the name you chose for your pied boy
Constantly trying to improve, always open to learning. For the good of the animals, education is priority.