Its bad phraseology. The point is that people watch blocks being built quite a bit, and if there was a trend of unhealthy blocks being produced (like the statistic available in mempool.space) then people would figure that out very quickly. From there, its up to you to redirect hashing power to a different pool, with the knowledge that if you don't you are losing transaction fees from censored transactions. Redeploying your equipment to a different pool is a lot easier and fast than dealing with something like, staked ETH.