I believe they are referring to the fact that the 'coded' (HTML/CSS) version of the design is paid, and it is only the graphics and layout (i.e. "Figma" design) that is free. https://openby.design/codedtemplates.html

For sure, I get that. It seems like that implementation (HTML/CSS) is separate from the design here, which is totally cool. The designs are open-source and openly licensed, but the implementation is not. That seems fair given their business.

The website mentions how the design world is closed off and they wanted to open this to do something about that. The attitude of "the implementation should also be open-source" seems like it reduces their efforts on the design side.

What's an "open source" asset? You mean "creative commons" licensed?

It's not explicitly labeled as CC on the license page, but maybe it's still considered CC due to the wording: https://openby.design/license.html

An asset is typically the final rendering of something, not the source that was used to develop that asset (image of design on Dribbble vs the Figma / Sketch files used to produce it). It's common for renderings to be made available online—although usually not explicitly licensed—but I more rarely see source made available.

In my mind, calling something "open" means that everything on offer is open. Anyone is free to do whatever they want, of course, but I wouldn't call freeware (software) "open" even though it's free to use without payment.

you are free to do whatever you want with the downloadable source files. Every design is completely open. From the dashboards, to the logos and upcoming other categories.

Alright.