There's no essay to write because the argument is simple: reductio ad absurdum & proof by contradiction. Saying it in this form makes it more entertaining, and it's pointless to add more jargon on top of it. If you wish to appropriate it, here it is but written in an even shorter form:

If two choices have the same utility (nihilism is objective) then you are stuck with the current one, i.e., since you are alive, then Spinozian conatus is the objective meaning of life

The triviality of the statement that you had pointed out is the core of the issue: interpreting meaning as a preference relation.