Professor Chris broke her promise, halfway.
Scientist Sterling did not receive the treatment he deserved—a Giant Tree Academy invitation.
Preparing the invitation takes time, and Professor Chris is not planning to temporarily keep him in the safety zone and deal with all sorts of potential troubles.
For example, someone watching them could abduct Sterling.
Sterling casually expressed that he didn't mind. In his eyes, there was only science and truth.
The canopy layer is strictly guarded; even without a letter, it's hard for other grade professors to enter. Professor Chris left him on the higher-grade layer, handing him an abandoned office being used as a storage room.
Hearing this incident, Professor Hagrid and the lower-grade professors rejected his arrival, even in the trunk layer. Even the old professor expressed opposition—
Sterling's theories were too dangerous, like the difference between fundamentalism and extreme fundamentalism.