TL;DR: It suggests several methods and makes a few mistakes which he had to point out to which it suggests even more absurd solutions to.
The AI recommends doing things in long and hard ways and does not conceive of new or novel technologies; it just mashes together existing ones despite their implementation being difficult or impossible by simply waving away these issues by saying things like "Much research and development would be needed but..."
It’s a system that has some notion of context and a huge database of information and is really good at guessing what words to put on screen based on the provided input.
It can’t think of anything new or novel, but can generate “new” output based on multiple sources of data.
As such, it will never be able to design a fusion reactor, unless it’s been trained on input from someone who actually did.