I'm hoping this test was mostly for the deluge system, not the booster, so they were running with extra safe engine shutdown limits. That's just blind hope, though.
I mean, I get the hardware rich testing mindset, but I thought the engine design was supposed to be stabilizing and getting more reliable. You have to admit that losing 4 engines in under 3 seconds isn't great.
Engine design is not stabilising yet, they are still pushing performance. Raptor 3s are now rolling off the line which again have increased performance. They also target a reduction in complexity with each iteration which should in the end increase reliability.
But reliability itself is a later target once the design is mostly settled.