Conclusion: that's a diagram of the obvious approach to building a thermonuclear device, which happens to be completely wrong for classified reasons, and if you pursue this design you're going to waste a decade before you figure out why.
If that was the case, an actor could go "this is obviously not the way to build this, lets move on" so in a way, you have sped up the development.
Just like saying, "We have 100,000 nukes" (a lie), everyone knows its a lie, which means we DO NOT have 100,000 nukes, as we wouldn't reveal the truth.
Enough of these little "misinformations" get released, the closer to the truth someone can get.
Or simply suboptimal.