The evidence that Uranus and Neptune must be icy is “all indirect, it’s all circumstantial,” says Jonathan Fortney, a planetary astrophysicist at the University of California (UC), Santa Cruz. “This was always in the back of people’s minds: that the planets could be more complicated.”
https://www.science.org/content/article/uranus-and-neptune-may-not-be-ice-giants-after-all
But all the claims are based on computer models, using old data and new information from telescopes. The only way to determine what these planets are really made of is to send a modern probe with modern equipment to the outer regions of the solar system.
And that takes money. And a whole lot of time.
Is this really the priority? Why aren’t we exploring ways to live on the Moon and Mars? NASA, get your priorities straight! Stop wasting time on computer models of planets that obviously will never support live and focus on those planets closer to us that could!
