This is bollocks. Typical clickbait title. There is still a lot of unsolved problems in physics, both experimental and theoretical. Particle physics is just one branch of science (and rather boring, if you ask me), popularized by CERN marketing, so people think new physics equals finding some new particle.
There is a lot of interesting problems waiting for exploration. I will not even try to list them "unsolved physics problems" googling shows enough.
That's a very uncharitable reading of the headline. I think it's pretty clear that it's talking about particle physics, not physics as a whole. At any rate the article makes this clear in the first line:
> Unless Europe’s Large Hadron Collider coughs up a surprise, the field of particle physics may wheeze to its end
It describes the standard model, what the LHC was able to find, what it hasn’t been able to find, and why there is skepticism about further discoveries. This is some high quality clickbait.
There is a lot of interesting problems waiting for exploration. I will not even try to list them "unsolved physics problems" googling shows enough.