Yeah, that one in particular was a pretty bad take. Who cares how many shitcoins people create? Just ignore them. That's like me claiming that the stock market has been undermined because people can start an unlimited number of companies.
It is a good take but it doesn't apply to random L1 currencies. It applies to L2 scaling layers with poor interoperability. Bridges create a wrapper of the bridged token. Once you have multiple bridges the ecosystem is fragmented. This means bridges and L2 scaling are a dead end.