I just checked on the color contrast on this slide, and it's 9.8:1 (#fffcf7, #424242), so definitely a pass from WCAG. I think the apparent lack of contrast is actually a function of font size and reduced screen size or resolution with the format the slides are in here.
A reminder that color contrast is a starting place, not the end-all measure of accessibility, since I agree it is not super readable!
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