Yellow flag went well before the corner 4 seconds after it went off, he get's the corner wrong and also lifts on the straight when he sees Ocon with no yellow flag.
I'm not sure that the yellow was the cause for the corner, I do expect him to still be able to make that corner. It's unfortunate, but he then lifts because he sees a slow car and puts the nail in the coffin.
Fair play for safety first, but I think he was very overcautious here and I think the mistake was genuine.
Not only this. Looking at the telemetry Lando has not lifted before the corner one bit and the mistake is clearly on his exit and the fact that he then lifted again.