Yes, it is intentional

https://hiking.biji.co/index.php?q=news&act=info&id=23995

Above URL is the announcement about upstream of Hehuan creek is no longer open to tourist for the protection of Formosan landlocked salmon since 2022.
Some foreigner did not know it, they see the trail from OSM and enter the area. Furthermore, due to the trail is abandoned for years, these foreigner got lost and called for emergency support.
For the sake of our natural resources and the safety of people who use OSM, I remove the trail on purpose. Thanks