While this is a step in the right direction, they've released the files under a Source-Available license. That's not Open Source. I would correct the article, as otherwise it looks like open-washing.
Keychron has officially made all of its keyboard and mouse designs open-source, including all of the wireless gaming keyboards and mice, making it significantly easier to design custom enclosures, mods, and add-ons for the relevant products. While these designs are not available for commercial use, the STEP files are free to download, and the community can suggest improvements in GitHub pull requests.