According to that article, the actual source of the damage is still under investigation:
" " At this point, I can't definitively say what fell on the house in Wyryki. It's under investigation, and we're waiting for expert opinions, " says prosecutor Agnieszka Kępka, spokeswoman for the District Prosecutor's Office in Lublin, whose military department is investigating the massive drone strike in Poland. A special expert, an expert in military weapons, will issue the opinion."
" What we were dealing with was a very precisely planned operation at the tripoint of the borders of Poland, Ukraine, and Belarus. It was intended to test our reaction and capabilities, but also to cause confusion. It was intended to do no harm, to destroy, so as not to trigger NATO's Article 5. Besides, I was observing what was happening in the Russian media at the same time. This clearly confirmed that Russia was behind it – Korovai has no illusions."
Regardless, whether the damage to the house was caused by the Russian drone itself, or by a missile fired to intercept the drone, Russia is still ultimately responsible, of course. There would have been no need to fire the missile if the dummy drone hadn't been sent in the first place.