> it expands to full res, 1713x16392.3

Three tenths of a pixel is an interesting resolution…

(The actual res is 1045 × 10000 ; you've multiplied by 1.63923 somehow…?)

I agree,

But it’s what I got when I went to Inspect element > hover over the image

Size it expanded to vs real image size I guess

Pixels have been "non-real" for a long time.

In some contexts. In this context (a PNG), they're very real.

This context is the moreso the browser, complete with it's own sub-pixels, aliasing, simulated/real blurring, zooming, etc.

But file-format context, yes, PNG, BMP, and TFF are the real lossless image kingpins.