The actual design was not the point of this piece, if anything, it’s an invitation to re-explore the design of the button. By being hung up on the implementation details, you have missed the forest for the trees.
Back in the early 2010s when I was doing freelance web development, I learned very quickly to stop gathering feedback from the client on specific steps because, for example, if I showed them a greyscale wireframe for page to solicit feedback on the layout, they would say, “the text organization looks good, but I wanted it to be these different colors, also I don’t like the Latin text in there, where is the content that we agreed would be in there? Also the logo is missing, also none of the links in the footer work, I don’t like the font, etc etc.” I thought at this point (and especially on this forum) we were past this sort of ill-informed feedback.