wow...he's new as a designer for me, but the influence is amazing. Is everything we think modern, just retro?
Yes, and it always has been. There's nothing new under the sun, etc... etc... At least not when it comes to things as easily explored as form.
all design is redesign.
The button colors give away that it's an intentional tribute, but how many design parameters are there for a 4 operation calculator? Especially since the hardware dictates the general geometry (e.g. taller than it is wide).