He is technically correct. 40 bytes OP_RETURN should be more than enough for any and all blockchain arbitrary data storage needs. Don't let lazy programmers and greedy hype riders tell you otherwise.
Yeah I don't think the bitcoin blockchain is meant to be a data hoarding NAS either.
I think the valuable anchor/notary use cases will fix this without any intervention. But on the other side, maybe a campaign to hardfork (change rules in a backwards incompatible way) to put limits on witness sizes. The benefits to miners at the expense of all other uses should be obvious. The legacy of big blocker attacks continues.