They're raising awareness on a very serious problem, sure, but doing so by portraying people who get injured in their classes as clowns.
To some degree the instructor is at fault here. After all, the point of Crossfit is to get people into shape through very hard exercise. It's the instructor's job to push people while somehow making sure that they don't push people past an invisible line that exists in different locations for different people.
I'm not saying the instructors are bad or irresponsible people, merely that they have very strange and very hard jobs. Arguably even Crossfit isn't bad, it's merely a symptom of the root cause. We're too busy and too undisciplined to get into shape with a proper diet and sensible exercise spread throughout the day, so we let "professionals" yell us into shape into a short yet intense time window.
And two of the fruits of this insanity are higher numbers of the population disabled by Rhabdo and this strange cartoon clown hooked up to a dialysis machine.