They surely mean that all odd number assets are running crowdstrike and even are running sential-one (or similar, %3, %4, etc etc). At least then you only lose half your estate.
I'd assumed that any essential company would be similar. OK if your purchasing systems for your hospital are down for a couple of days it's a pain. If you can't get x-rays it's a catastrophe.
If half your x-ray machines are down and half are up, then it's a pain, but you can prioritise.
But lots of companies like a single supplier. Ho hum.