Recreations of Windows UX in a webpage have been done a million times and I've never heard of Microsoft suing them. I think they have better things to do.

As a design showcase it is odd to basically trademark/copyright infringe all the visuals.

In university design classes they made it pretty clear we should take care choosing sources for assets we used, even as a base for our work. At least back in the early oughts. Maybe it's different now that crime is legal.

What you say is true, but as an HR person i wouldn't care too much about the copyright aspect, more about the fact that this showcases nothing about the guy's actual design abilities. That's more a feat of a front end dev integrating an existing design, which is impressive but this aspect has been mostly vibe coded, or at least "vibe taught" (is that a thing ?) according to OP himself