[Lazare]

For anyone curious what's going on here:

You can't carbon date human activity, you can carbon date the point that organic material stopped growing. If you carbon date some partially burned wood found in the remains of a fireplace, then you can be pretty confident the fireplace was built around the time the tree the wood came from was cut down. And the better you can prove that what you found was actually a fireplace and that the sample actually came from inside it, the more confident you can be that the date you got relates to human activity.

If you just dig a hole in the ground, find some organic material, and carbon date it, you can be pretty confident that there were plants growing in the area in the past, but that's all you've discovered.

Guess which approach to carbon dating was followed here?

There's basically zero evidence presented that the pyramid was constructed 16k years ago, but they have made a strong case that there were plants growing in Indonesia 16k years ago. ...not that this was ever in any doubt, mind you.