@Mara "Her game was decently complex and everything she did worked and it didn't crash and she seemed to have understood pointers well"

The first three items there already mark that 9 year old as an above-average game developer. The fourth point marks her down as an utter genius. The style of the reddit post feels incredibly #thathappened, but on the off chance that it's genuine I really, truly hope that dad gets the scales lifted from his eyes and sees how amazing that all is.