It seems like a big deal to me and the entire shift is an indicator of how much the IT community is behind front end clients talking to a separate back end. Server side rendering is no longer considered normal. Server site rendering now means something entirely different. It is about running your frontend code on the back end, So you still have the separation, but instead running it on the same machine. Now the same ui code has to be compatible with two different run times. This is much, much more complex than traditional server side rendering.
I'm glad we now have things like single page apps and client site interactive applications, because some apps were really not possible with server side rendering unless with a lot of Jquery hackery that quickly becomes unmaintainable...
However, I do think that front end technologies are overused, so I agree with the author, And I also think this is objectively a contrarian opinion, considering my initial point.