It is a good resource to have, and nice to have that document. But, it needs some interpretation when presenting it to decision makers. It essentially says that disc golf courses have an impact on the environment and it makes some effort to quantify the impact. Lacking any context or interpretation or comparison to other forms of recreational facilities however, it doesn't say much.
For instance, what is the environmental impact of a typical golf course? A typical groomed city park? A basketball court, a sports arena, a softball complex?
What the document essentially says is that disc golf courses have impacts in three main areas: soil eriosion and compaction, loss of vegetation, and tree damage. No big surprises. It attmepts to quantify through data collection the impact of compaction and vegetation loss around baskets. The results are also not surprising: the closer to the basket, the more compaction and vegetation loss.
Suggestions offered are also not surprising and are well adopted in disc golf course design and maintenance: harden areas around tees and define and harden trails, protect trees from impact damage, move baskets regularly to allow soil and vegetation recovery, and spread bark chips around baskets.