I think it's consistent with the rest of the post. The claim is that long-term bitcoin is either going to be worth a shitton, in which case having 10 is enough,

I think it's consistent with the rest of the post. The claim is that long-term bitcoin is either going to be worth a shitton, in which case having 10 is enough, or 0, in which case having more than 10 is pointless. Buying more makes sense if you're planning to sell somewhere between, like if it gets to $10k.