You example of a 51% attack on a blockchain is another "blockchain" that is extremely centralized and basically private, as in, it can be turned on and off by central control. I'd suggest the entire design of Solana is a 51% attack.

It's not new information or news that small, poorly decentralized blockchains can be victim of a 51% attack. A decent article would have spent time understanding the exact mechanism it is done by, and evaluate which chains are actually susceptible to this form of attack, rather than just generalizing and saying "it could happen again on another blockchain"