USB-C is... non-negotiable IMO. And we're already dealing with manufacturers 'creatively' implementing it in such a way as to inhibit the use of non-OEM cables by recessing the port and adding proprietary grooves and such. And Sharkoon has provided no pictures of the connector or port on their product page.
Further, they're using a low-profile design - cool - except that one cannot use standard Cherry MX keys. And while the boards do weight over one pound, the biggest addition to noise or noise control comes from the rest of the keyboard. Assuming that the keys are soldered on, if Sharkoon didn't pay special attention to internal dampening and proper lubrication in the right places, well, these keyboards are going to be pretty loud.