I noticed the same thing. It's the first thing I check when someone describes a font as "legible." I want to see O0olI|i diplayed.

The photo actually shows some slashed and some non-slashed zeros too. Look at the PSI numbers on the left versus the time numbers in the center right.

That doesn't seem great from a UX standpoint.

codepoint E007 is a slashed zero... would be interesting to know why this is not the default