Whether the author is right or not, the tone of the article is so intensively dismissive and the arguments are so poorly supported by insults, that it's barely worth reading at all.

My view?

The author may be right, PHP may be a worse choice over Go when you're aiming to create a massive "serverless" structure. Then again, it doesn't consider any of the potential future directions PHP may take over the coming 5 years.

In addition to that, some of the largest sites run on PHP (Facebook, Wikipedia, ...), and I don't know why they should quit any time soon.

Lastly, even if Go overtakes PHP on serverless, it's not clear whether PHP was even a great target for serverless architectures to begin with. In my personal experience, PHP shines for small to middle-size applications, and companies like Facebook prove that it's suitable for gargantuan applications too.

TL;DR: bad article