Ok, let me get this straight. So they fake the moon-landing. They spent a fortune doing it. The best creative minds are devoted to getting everybody in the world to believe that they went to the moon....
But, they use something that looks like it was made as a grow tent to do it. Clearly, as you say, this thing could not get to the moon. So why would they use it? Why didn't they just make it look more substantial if their goal was to get people to believe?
The answer is, because it was sufficient to do the job! Because they did use it to land on the moon. Whatever your flawed sensory matrix tells you about how sturdy something has to be to do things in space, there are actual factual answers. When the engineers designed this thing, they did not give a fuck about how a tiny group of retards felt about how it looked. It just wasn't a consideration. Sorry. It was designed to actually land on the moon.