believe me, French cooking does not need Polish cooking
I don't believe you as it happens. Cooking, whatever the countries involved is a process of constantly borrowing, adapting and improving. Choucroute Polonnaise is an improvement on bigos, brought back by soldiers who'd served in the Grand Armée.
. As to Tarte Tropézienne, the only connection with Poland is that the baker's wife who invented it was (or is, if still alive) Polish. Furthermore, that so called Tarte tropézienne is completely unknown outside of Saint-Tropez
Double rubbish. Either ignorance, trolling or both. It has nothing to do with anybody's wife; it was based on an old family recipe, and if you google it, you'll notice how bizarre your second 'point' is - it's actually very well-known throughout France and beyond.
It would be interesting to know the original Polish recipe and what the nearest equivalent is in PL today.