Edit: I've thought about this more and think this is wrong. There should be a non-handwritten transcript link at the top. Embarrassingly, I focused on thinking about screen readers rather than accessibility more broadly.

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(I've read a bunch about accessibility, but I'm no expert).

I don't know, I actually think this blog is more accessible than most.

You might have missed the transcript link at the bottom.

The only changes I'd make is adding a summary alt to the image saying something like "The handwritten body of the blog post. A transcript is linked below".

(Without any alt the page might be confusingly blank, but as many screen readers poorly support long alt text you don't want to copy the transcript in.)