You are confusing Ethereum with Ethereum Classic. The two are completely different blockchains.
You gave the wrong link here:
The correct link is here:
Also your argument is misguided. Decentralization is not measured in terms of how many pools there are but how quickly the network can punish bad actors. If you believe that EOS can punish bad validators that create blocks which are harmful to the network faster than the Ethereum network can then prove it. Its not easy to identify all the necessary assumptions required to make such a statement and then to qualify which network can punish bad actors more effectively.
My point is that these “rule of thumb” guides which provide you with a “general idea” of how centralized / decentralized a network is are WRONG. Taking about this idea in such superficial terms is not helpful and it creates misconceptions which are persistent.
Analysis of network security architecture is difficult and it takes a great deal of skill and time which is why most people don’t want to / can’t do it. But don’t over simplify the problem as that simply creates misconceptions about how security on the blockchain actually works.