That's a good point, and it took me a bit of trials to force Chrome to print canvas in vector. The article links to the MDN <canvas> demo [1], which doesn't print in vector if you try it. But you can run the following in the console and then try to print the same page, which will be vectorized:

    window.onbeforeprint = () => {
        window.canvas.width |= 0; // clear the canvas
        draw();
    };

So I guess, for now, this behavior only manifests when you use the beforeprint event.

[1] https://yari-demos.prod.mdn.mozit.cloud/en-US/docs/Web/API/C...