Are the covers that claim to have heat dissipation real or fake?

For a number of years now, I've seen some circumstances say they’ve grooves or patterns to dissipate warmth. I’ve carried out a number of exams with CPU throttling, Antutu, 3DMark, and many others… And I’ve by no means seen a distinction in temperature between that case and the clear one which comes with the telephone from the manufacturing facility, what's extra, doing the exams with out a case solely exhibits a level of distinction and never at all times (talking of battery temp). The query is, does it make any logical sense that these covers can dissipate warmth higher or is it a faux?

https://preview.redd.it/pc4y3l0evxab1.jpg?width=1000&format=pjpg&auto=webp&s=943d111bdf4556aaaf52d9d1eb320577a9797a04