Poland will continue to dwarf all of its neighbors as an investment opportunity
Not to be too pedantic, but that statement is factually not true. Poland neighbors Russia directly, as well as Germany. If Germany is to be considered an unfair comparison, then Russia should be comparable.
This data from 2014 shows Russia high above Poland in FDI per capita (it would not make sense to compare absolutes):
What's curious from this data is that Poland is in fact an investor nation. Russia has an FDI per capita of $492, while Poland is negative with -$119. At face value this indicates that Polish businesses find it more profitable to acquire/invest in foreign assets than deploy the capital at home. It's possible that if you strip out investments into energy projects from the mix, that Russia will have a profile more similar to Poland's, with money earned in Russia leaving the country, but as it stands it looks more attractive by the numbers. Slovakia and the Czech Republic are also far ahead of Poland by this measure. The New York Times article said as much in one of the paragraphs. The argument the author laid out there was not about large infusions from abroad, but rather a steady build up at home in traditional sectors that have disappeared or are close to disappearing in most other OECD countries, i.e. manufacturing.
FDI per capita (Europe - 2014)