The way the author dismisses engineering concerns lets me strongly doubt that he is an expert. There is a discussion on fuel, spare parts and personal, where he basically says that he doesn't care.
The burning of nuclear fuel is actually very closely managed, fuel elements are regularly shuffled around because the ones in the center burn up faster than the ones at the edge of the core and the shuffling around is planned a long time in advance. So, when the end of life is planned for 2022 then the plan is actually to have the fuel spent at that date and you couldn't get much additional power out of it.
The same is of course true for spare parts. First of all, the industrial environment that supplies spare parts knows since 20 years about the plans to phase out nuclear and plan accordingly. They are actively trying to run out of spare parts right now, while of course all the maintenance task that get a rating of "should be ok for some time" get skipped in the power plants. That means, that they would need major maintenance right now, while the spare parts are planned to be not there and the industrial capacity to build spare parts has been re purposed or dismantled.
The same of course also for personal, they knew for a long time this was coming and planned their careers accordingly, though this is probably the least problem of the tree, but still that lets me doubt wether the author ever did plan a moderately complex project, let alone being an expert about nuclear power.