I'm sorry but you're wrong: effect can be used to mean to cause something to happen. This is different from affect's verb form, which is to influence something.
Affect also has a noun form, if you're curious. This duality of effect and affect having both noun and verb forms, even though each has a more popular common usage, is a common thing to misunderstand.
Assuming what he's saying is true, I still keep coming back to this line:
“My boss said, ‘I would have killed someone who said what you said in the meeting.’”
How does someone say something like that? And how is this something that he's never been called out for?
The other person is saying that devaluing the US dollar would make it easier for others to buy American products.
I assumed you thought they were talking about strengthening the US dollar, so I pointed out that the original post (yours, I realise now) was talking about devaluation. Not sure why you think devaluation would give greater buying power.
The point they are making is if it ends up in a landfill anyway, then you've wasted more energy/resources recycling it.
If it stays on your shelf, that's not what they're talking about.