That is not a landfill.

I think they misspoke - they likely meant the north atlantic ocean: https://www.pbs.org/newshour/show/ghana-becomes-dumping-grou...

Since you seem to have missed the point:

tell that to the people putting the waste into it.

Almost no plastic waste in first world countries ends up in the ocean, thankfully

Source?

Also, you probably meant to say "developed" countries and not "first world".