The images do resize and reflow, to adapt to the viewing context. My phone is an iPhone Mini, and I use that as a lowest common denominator, although I do test with an original SE.
But if there's a place where the text doesn't separate (and flow below), that's a bug, so I'll review.
Specifically in [0] all the images after and including the stirrups have less than one word of text next to them. If it helps inventions cuts off as inventi-ons. I'm on iPhone 8 safari if that helps but is also an older target so as I said if it's outside of scope not necessarily something I'm terribly worried about, it's still readable just a little annoying.
Good browsers come with mobile emulation in their dev tools that let you test with arbitrary viewports as well as the viewports of common phone models.
But if there's a place where the text doesn't separate (and flow below), that's a bug, so I'll review.