Apparently the hypothetical future humanoids, somehow ignorant of all prior history, who will, ignoring all warning signs, start eating as much of the waste as fast as possible, then ignoring the obvious connection between eating that stuff and getting sick...

I wish I was kidding, but the argument does seem to be "what if 100_000 years from now somebody digs this stuff up and a few people get sick or die".

It's concern trolling at its worst.

Neither concrete nor steel have the lifespans we're discussing thousands, or tens of thousands of years.

And. Bacteria.