Performance is a concern for many people, and this is somewhat overlooked because of the number of people here who work for companies where scaling is the primary concern. I think this is what he meant by people outside of VC-backed startups. I know of multiple companies that have had outrageous cloud-hosting bills and have had to hire fancy consultants to fix it.
I see no reason to start any greenfield project in 2019 in PHP unless you literally only know or ever want to learn PHP. I could be wrong in terms of the entire language and it's ecosystem could have changed in the 18-20 years since I deliberated interacted with it last... We have a lot of things since mod php, so there's many other options, most of which don't involve PHP, so I suppose true fans will build their web apps in forth, I dunno...