There are a lot of horrible misconceptions inside of that because the purpose of a consensus algorithm is not to make a blockchain fast. The purpose of a consensus algorithm is to keep a blockchain safe. A lot of the time, when a blockchain project claims: we can do 3,500 TPS (transactions per second) because we have a different algorithm, what we really mean is we are a centralized pile of trash that only works because we have seven nodes running the entire thing.
What would you say about it?
There is nothing to say. It is long time known fact. Cryptocurency should first be decentralized. If it is not then it can be easily taken down and is not really a cryptocurency. There is lots of coins that are not decentralized. And from unknown reason people like and buy them and believes they are cryptocurencies.