Sorry, but it's not true.
Look up US v. Rock Island Armory. A section of NFA '34 was declared unconstitutional, and the government did not appeal because they didn't want to widen the scope of the decision.
His ruling is also unequivocal that the federal government is henceforth enjoined from implementing Obamacare, unless, and until a higher court rules differently.
The judge believes that a declaratory judgment was enough. But, without an injunction (which he explicitly denied), there are no apparent penalties for ignoring him.
But in my view, our system of jurisprudence has become complicated beyond all redemption, when ordinary citizens can't have confidence in such a clear and unambiguous ruling by a federal judge. In other words, "unconstitutional" doesn't necessarily mean "unconstitutional" in our modern world.
Thanks to lawyers and leftists, the law means anything the ruling oligarchy wants it to mean. And they wonder why there's a Tea Party.