It's tough to determine the authenticity of the story. It could be a blend of fact and fiction, crafted to entertain or convey a particular message. Without more background information, it's hard to give a definite answer.
Definitely not. 'Tuck Everlasting' is a work of imagination. It was created by the author to tell an engaging tale rather than being based on real events.
The conclusion that Friar He was a spy from the Qing Kingdom. Although the play did not reveal the reason why Friar He was controlled by Chen Pingping, from his attitude toward Fan Xian and his own statements, it could be inferred that Friar He was not a Qing person, nor was he a Qing spy. However, Chen Pingping had grasped a certain secret of Friar He that was disadvantageous to him. He used this secret to control Friar He. The specific details and the final ending of Friar He would have to wait for the second season's update to know.
I'm sorry, I'm not familiar with the specific 'Friar Botod' story. It could be a relatively unknown or regional tale. You might want to check local libraries or specialized folklore collections for the full story.
Yes, it might be based on a true story. There could be a real - life event or person in New Hampshire that inspired the concept of 'Friar New Hampshire'. However, without more specific information, it's hard to be certain.