Do you know what the current felling plan is?
The plan is to go from 48,000 cubic metres to 180,000 cubic metres. A huge increase.
In the III RP in the 1990s it was at roughly the same level as in the PRL 1980s -- about 150,000 cubic metres a year.
By your numbers then, PiS want to fell more than the PRL did.
I don't think any of us could possibly disagree with that. Why are the PiS regime hell-bent on chopping the forest down?
From what I gather, it's related to Podlasie politics. Under PO, the plan was to eventually turn the entire forest into a national park to protect it. One of the failings of PO was to push it through (they backed off under heavy pressure from LP) - and PiS made a huge fuss out of how PO didn't care about the livelihoods of local communities there and how they would permit much more logging.
Either way, there really is absolutely no reason to touch it. LP is rich in cash, and if it gets turned into a National Park (with the correspondingly lower salaries) - LP could easily subsidise their wages to make up for it.
Ideologically, foresters also want to cut everything in sight because they want to manage it, even though Białowieża should be left as a wilderness to protect the most valuable part. Let's not forget that there's also a huge impact on local animal populations too.