This graph is not related at all, it’s from 2021 and it’s global investments, look at the y axis. Poland would barely be shown there as pixel.

Did you have a look at the document ? The graph is on p.16

And in the other graphs in your link you can see that US investments in Poland were less than Belgian or Swiss or Swedish

It’s in second position though ?
(And while it’s not directly foreign investments it’s still closely linked which is why i wrote “good enough”)