Speeding is dangerous but running a red light is straight up reckless.
In my experience, the vast majority of the time cyclists run red lights, they check both directions before going and there are not conflicts. The examples shown in the article are fairly rare.
Plus, the danger from a cyclist running a red light is mostly to the cyclist, while the danger to a driver speeding is to everyone nearby on the road.
Add on top of that the fact that there are many more drivers on the road than cyclists. The net effect is that speeding is a much bigger safety problem in total than cyclists running red lights.
(Note that I'm not endorsing running red lights.)
It's also dangerous to pedestrians. I see cyclists run red lights with pedestrians in the crosswalk almost every day, and many of them seem to assume that people will stop walking and yield to them. If somebody doesn't notice the cyclist then this can easily lead to a collision.
I've never seen an accident arise from running a red light.
Which isn't to say that I think running a red light is "safe" but I think the context in which one runs a red light is probably a bigger factor than blanket denunciations imply.
In America, running a red light usually means something like "while driving a 4,000 pound car at 40 miles per hour [6.4 million mv^2], the driver blows through the red light due to complete unawareness of the signal."
Whereas where I live it is more like "a guy on a scooter (360 pounds net), slows down (somewhat), sees a gap in the traffic and zips through at 15-18mph." [116,000 mv^2; the car is 55x worse]