Somehow you make it sound easy or even belittling it.

I'd say this is quite an achievement anyway when I know I'd use more space than that just to store a single jpeg or mp3 sample.

I think what parent was trying to say is that it's absolutely an achievement relative to storing a jpeg or mp3 sample, perhaps not so impressive next to the old 4k intros.

...as opposed to another hundred MB or so on top of that.

Could you show me what you can achieve with 4 KB on top of hundreds of megabytes of libraries and drivers?

You don't have to be a car manufacturer to criticize a car and not an architect to criticize a building.

"If you can't do it better, shut up" is a stupid argument.

"That's easy, anyone can do it" is similarly stupid, especially when anyone who actually does stuff like this says it's impressive.

But nobody said that.

There's a pretty clear implication.