He's right about every user of every open source project. The license gives you code, it doesn't give you trademarks, infrastructure support or moral support.
I am amused to see the usual HN vibe both complaining that commercial entities crowding out creators with their own software is violating the "spirit of open source," and insisting that FOSS maintainers don't owe you anything morph into commercial entities don't owe the FOSS maintainers of the software users anything, and are owed trademarks and access to infrastructure.
WP Engine is a hedge fund spinning money out of FOSS. It's fine, it makes more choices available for people. But the idea that Automattic has to acknowledge them, and that acknowledgement cannot be hostile, that's not in the license.