People know Ms Kirsch and bob gray were never real right?

I’m seeing people on TikTok and everything make theories about how it took bob grays pennywise identity but none of it was ever real bob gray is a alias that it uses most likely for Ingrid’s story it was never real ive never read the novel but ever since i seen the 2017 movie ive been deep into the lore since and those 2 people never existed idk why it is dragging these interactions out with ms Kercsch in Lilly but ms Kersch is the old lady seen in it chapter 2 talking to Beverly that turned into a monster