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This author is excellent. I found their blog earlier today when relaying advice on setting up an iPhone for someone to use after a stroke. ( https://veroniiiica.com/iphone-accessibility-settings-for-st... )

My eyesight is not even that bad, but I fpund the large contrast and for really easy and enjoyable to read.

It is nice but the website has some obvious contrast issues such as in the header. "Veronica With Four Eyes" is black text on a dark grey background

I think that's something on your end. Looking at the CSS (and checking in dev browser) it should be #0a0a0a on #fff (light) or #fff on #111 (dark)