Even if it was real, Hollow knight is a large game. It would take up tons of storage, and probably wouldn’t even be able to run because most IOS phones have 1 gb of ram. If you don’t know what ram is, its basically memory, but for your running apps.
Hollow knight passes the 1 gb of ram limit while in an area.
(Hollow knight running inside an area above)
Not to mention the GPU and Power Usage it takes up, which are both high.
Hollow knight was never made for mobile, it was made as a console and computer game.