As someone with astigmatism, I prefer dark modes in almost all places as long as it's done correctly. Bright screens with dark text cause significantly more eyestrain for me. My wife also has astigmatism and prefers light backgrounds with dark text. For the same reasons. I think the key here for accessibility is choice.
Note that they don't believe it posed any additional health risks, they identified the issue that caused it and believe it affected single batch: "All the vials came from a single lot, but shots from two other lots from the same Rovi manufacturing line were suspended as a precaution." So likely nothing to worry about at scale.