Who is right?

What happens in this video I find happens a lot in my games. I have an enormous wave pushing into the turret, which means a lot of gold and potentially experience (depending on how far away the fight is) lost if I go for the kill rather than the CS. The wave also means I am a level down, and (irrespective of whether this is optimal) I am running Inspiration/Resolve (Celestial Body, Kelptomancy), and am Nasus, so am not really a damage threat to minions level 2 let alone another champion. I warning ping kha'zik back as to infer that I don't agree with ganking here. In my mind, this gank is plain dumb, but curious as to what other think - am I wrong to ignore this and farm? What is the right play here?
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