What is so hard to understand about Apple's statement that no-one should draw any conclusions about the upcoming hardware based on this DTK?
The chip in this thing is a 2 year old iPad SoC, and something they put together "...without even trying..."
Whatever they ship for the production Macs will undoubtedly be very, very much more capable and powerful and support all that you'd expect a Mac to support. I, personally, would not be surprised to see the Apple Silicon Macs run 3x to 5x (likely more) the processing power of the currently shipping Intel products.
The Macs are very likely to have a fan, even if these don't.