This is quite interesting. I hadn’t heard this before, not even in the thread about foreigners buying Polish properties.
It is true. Foreigners are allowed to buy a flat without any permission, and as many as they wish. They can also buy a private home on a parcel of land less than 1 hectare also without permission, although, permission may be necessary under certain circumstances. Anything exceeding 1 hectare needs permission without a doubt until the year 2016. This mostly has to do with the status of being a 'farmer' and the special privileges they have when it comes to insurance, pension, and taxes.
To me it is clearly a hidden market in Poland that most foreigners don't pay attention to. Also, all of the property price reports focus only on flats, and not the houses on larger parcels of land. They tend to group everything into 'property' or 'houses', which isn't accurate at all. It is true that there are currently an abundance of flats on the market for resale. Small farms are much more scarce, although there are some still to be found at reasonable prices.
That date is for ever changing
It really is. I remember at one time the date was 2012, and then got bumped up to 2016. I think Poland is trying to keep the date in sync with when Germany allows Poles to work in their country legally.