While some people might not see the need for it, the author lists several reasons why it'd be nice to have. The article mentions that there are multiple old (and no longer working) workarounds and tricks that used to allow for 80x25 and presumably those existed and were shared online because others also wanted it.

I don't see why it shouldn't be possible? It seems like a reasonable thing to want to be able to change and even force resolutions to whatever your hardware will support, especially if there's a large amount of old software out there which expects a certain resolution. Old computers are very nice to have, but increasingly difficult to find and find working parts for. They also tend to come with some pretty big trade offs in terms of size, noise, and energy inefficiency. It'd mean a lot of less than ideal hardware just to get back something that people already had.

He wants to use a display mode with rectangular pixels. No matter what he does in software, that’s going to require specialized hardware. It’ll take a real CRT. No LCD ever made can change the shape of its own pixels.