Those trees will mature in 2050ish timeframe. If this person put together a trust to manage the particulars, they might be alive to ensure the trees get harvested and processed into paper.

Trees get turned into paper every day, I'm sure there's a paper mill willing to take the work, especially in Northern Europe.

I like to imagine futures where they judge us through their standards as harshly as we judge the past through our standards.

So, instead of some future people celebrating this project, they just think "Ew, what kind of monster would wish harm on a beautiful old tree?"

Or they look on it with nostalgia because by then most people use emoji as written communication and have never learned to read.