I find it truly sad that every single one of your images seems to fail the most basic of accessibility norms. Particularly legible colour contrasts.
Remember, design is not art unto and of itself. Design is engineering that incorporates art, and we have far too many people out there who klnow art, but not accessibility, separation of concerns, actual user-experience, or any other engineering concept that separates the two.
Nonsense like this article is why we have so many artists under the DELUSION that they're some sort of "web designers" whilst lacking the knowledge or experience to be designing much of anything.
That you even have a section talking about legible colour contrast, but focus on "yellow" whilst ignoring that your white over images, white over pastel salmon, and so forth in nearly every other sample on the page is an utter and complete failure under the WCAG.
Might I suggest you che-checkity check yourself before you wreck yourself by using tools like this one?