That depends on exactly what itis supposed to mean. Some people se it to mean that reality is not accessible outside an interpretational framework - that's a Bailey version. A Motte version would be that there is literally nothing in existence except human-made theories. Physicists often aren't good at stating or noticing degrees of realism and anti realism, since they aren't trained for it,
I didn't interpret shminux's statement as being about realism. There is also the theory that as we move into higher and higher energy we will cover more and more and more specific rules and never reach the terminal fundamental rule set. in other words the fundamental rules of the universe are fractally complex with the fractal function being unknowable.
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.