300 trees per day. Even if it's just one person doing this, that's just short of 101.000 trees per year. The fastest growing timber tree IRL is Paulownia fortunei, reaching maturity in 10 years. This extreme deforestation would leave barren wastelands and the only wildlife left to be hunted would be rabbits and preying birds. Even if it was only 300 once per week it's ~15.600, and once per month it's ~3910. Any of these would be disastrous, making the area prone to natural disaster such as landslides and flooding. Not to mention wildlife migration causing problems in other areas. They're not magic users, so unless they have timber trees that grow extremely quickly they either need some sort of forestry magicians or import nearly all their food because at that rate of expansion they would hit other national borders very quickly, and being under a slave contract they cannot fight for further expansion without geopolitical repercussions on a grand scale. From this we can infer that the most likely explanation is that whoever is backing this village has plant magicians, especially considering page 5 where you can see the village walls from the deforested area. Regardless, calculating this considering that we might have magical trees that mature in t(x) without considering soil composition is pretty fun math problem when we're dealing with a circular village, circular area of deforestation and accounting for the estimated distance between the trees as shown in page 5. Either magical trees or plant magicians.