Because its kind of logical to believe it.
Lets say we know that lil devil will give a 30.000 RTP return ,, once every 10 million spins.
If you spin once.. you are in 1/10,000,000
If you spin 5 million times, you are 50/50 to hit.
It’s correct to say this. but also, not guarenteed.. the guy spinning once, could still hit it.