It's more of a joke when a non-physicist tries to explain how something like a thermonuclear devices works.
The general outline of the fission-fusion bomb has been out there for quite a long time. The details may be missing, but we currently have SEVERAL nations with sufficient knowledge of that process to have made successful bombs.
BTW, it's an ENGINEERING PROBLEM. Most of the physics was worked out and published back in the 1930s.