Very good case choice imo, unluckily some of those big, dual tower CPU air coolers won't be able to fit. An AIO makes sense there imo.
There are two versions of the case, only the "digital" comes with the three fans. But maybe I remember incorrectly.
For noise levels, all I can say is that the NH-D15 is more quiet than the Crosair H100i in my second (kid) PC. Tested it as a potential upgrade in my own system and... no that one is way to loud for me. The kids can suffer though ;)
About Ryzen getting hot: There is a lot of misinformation out there, paired with old AMD FX-9590 memories. Those new Ryzen 3000 CPUs are pretty good from a temperature perspective and easy to tame. Even those stock coolers are good enough.
For example:
I'm getting ~69°C during CB20 on my 3900x, with a D15. That's not bad for 12 cores.