Firstly, You took of sideways, A gainer is gained by momentum straight upwards,

your arms were way to fast to get any momentum, you managed the flip kinda, but still landed sideways from the straight landing you need to get, you even broke of your one foot. aswell as grabing one of your legs.

So from what i can see it's realy not a close encounter to what a gainer is.
Try enhancing more and geting straight.