Even if they didn't test AT ALL, a rolling update would catch this before it was unleashed on the world. Good thing that's part of their strategy:

CrowdStrike will also implement a staggered deployment of Rapid Response Content, ensuring that updates are gradually deployed to larger portions of its install base instead of an immediate push to all systems

Why are they promising things that are just bare bones developing stuff that even backyard coders do? This brings the opposite effect of calming things down.

Crowdstrike are not a real security company. They are a popular company that people who dont know about security, but need to tick a box, use, so management can feel pleased about themselves and all have a pat on the back and a mutual wank. Crowdstrike are either a direct intelligence operation, or a propaganda outlet. They pump out anything they are told to (see "Russian collusion!"). I wouldnt be surprised if their software does nothing except rifle through everyone's hard drives for data to sell.

I doubt it.