Meta rant: Why, oh why do people use low contrast colors and expect people to be able to read their blog? Has nobody heard about accessibility? Or do they not care, because “I can read it”.
Genuinely, no. For those who have it, vision is such an integral part of...well, existence that intuitively grasping that people have completely different ways of perceiving it beyond the obvious is extremely difficult. This goes a bit beyond the "try to explain 'blue' to someone" troupe. I have difficulties explaining my own brand of vision difficulties (or hearing difficulties, for that matter) without basically explaining the optics of vision and going from there.
For instance, for folks with without some kind of color difficulties, being able to look at two colors (what most would perceive as) completely different colors and being able to say "those colors would look the same to color blind folks" is almost impossible without training or extra tools.
So no, it doesn't occur to someone without training to constant question their own perception, unfortunately. The most we can do is give web masters a shout when we notice and promote accessibility tools wherever we can
So I completely appreciate accessibility options. I've tweaked my iPhone settings to improve contrast wherever possible. What annoys me a lot is how many app designers think some form of gray-on-gray text is perfectly readable. No, no it's not. Black on white, white on black. Something with more contrast, please.
Having a thin stroke (the space font face) and small character size (18 px, which is a 12 pt equivalent) for your typeface typically means that you need to increase the contrast to compensate.
In other words, 7.5:1 is insufficient given the design choices. Even if it's "legal".