Whenever I see a laptop with a >15W TDP CPU in a super slim package with a tiny heatsink/fan unit, no matter if it's from Apple or another vendor, I'm very suspicious. At least the 12 inch Macbook from a few years ago which was truly fanless uses an appropriately low powered CPU.
disclaimer: used to do systems engineering for a server manufacturer a long time ago, after you've gone through a dozen iterations of ways to mount skived copper heatsinks on dual socket motherboards in 1U cases, with various fan solutions, you realize that everything that is not acoustically terrible is some sort of compromise. People are trying to put CPU+GPU+RAM packages that are anywhere from 25W to 45W TDP in laptops that are physically too small for them.