If the wood were burned locally (and without the additional expenditure of pellet-making), I could see a sustainability argument in there and support it. The place I live in is heated by firewood. If it makes it any better, it's delivered from less than 10km away, by a farmer that manages his forest with respect. It's not the best, but considering it's worked for generations that way, it seems renewable enough. And it's a mountainous region, not really usable for anything else agriculturally.
But considering the majority of Estonian exports is just for heating two extremely wealthy european countries with a industrially processed wood product, I just see affirmation of my prejudice that the Eurozone and EU mostly exist as a tool for the richer global west to exploit poorer eastern countries that get added to the union when the existing ones are squeezed dry of their resources.