Its not a misunderstanding, however I think you may not understand how a rocket works or how much it costs. Building and fuel are the problems, thats why SpaceX are successfully reusing theirs.
There are other methods of quantifying whats on the moon other than a man is a spacesuit with a shovel and spade.
The Donald doesnt often have a wider point. Fondly remembering a previous time is vein that runs through a LOT of his posts and speeches, its something a lot of dictators and sociopaths do.
Building and fuel are obstacles sure, but then what isn't when you're planning on going to the moon?
And what other methods other than man-travel are there for 'quantifying' if we can live on off-world bases? The moon, and Mars, are our candidates for that and there are already research projects worldwide which are looking into this. And regarding mining, a robot can only do so much if it's relying on signals from another planet.
And speaking of SpaceX, there's a lot of excitement with what they're doing, if they manage to successfully re-use rocket-equipment for manned missions to another planet then that's a brilliant development.
Re: the Donald...can't we just give him a break now 'n then? It's an interesting topic he touched on, with some truth to it. Giving him a break gives you lot a break, in a way.
You bad addicts.