What was thah thing?

In the end I no longer understood that chapter, how is it possible that the house existed in 1930, if the son of Alcatraz appeared in the 60s with the war of Vierman? Perhaps when he transformed into the house the past also changed and that's why there were people who remembered shooting him? Why did the house have the power to attack people? Why could he deform them? Why would he say that he saved his victims?

In the end I no longer understood that chapter, how is it possible that the house existed in 1930, if the son of Alcatraz appeared in the 60s with the war of Vierman? Perhaps when he transformed into the house the past also changed and that's why there were people who remembered shooting him? Why did the house have the power to attack people? Why could he deform them? Why would he say that he saved his victims?