What do you mean? I do not understand what you are trying to say.
I think he misunderstood - or didn't read your post at all.
From my perspective it is unethical. At some point, it is analogous to "tricking" someone to buy something that doesn't have any value in the future so it won't be profitable for them. This is not a trade, as somebody, in the end, won't get any benefits. Even if there is a possibility that they do want to buy it, there's also a possibility that they don't know the coin is dead, or they will use the coins bought from you to scam others by thinking that this coins still has some value (or simply doing a pump and dump).
I believe it is better for you to not sell it after all. Somebody will be at loss in the end cause the coin is dead (assuming what you said is true).
As long as you are even doing something at the detriment of the other person for your own gain, that is a scam !
That is more like stealing from someone just to pretend to them that what you are selling to them is the real thing, whereas, it is fake.
The first thing the OP should have asked himself is how would he feel if someone actually ended up doing that to him ? Probably he should start from there and the answer he ends up giving to himself will be the answer to his own question on whether what he asked is unethical or not.
However, if this is done on a normal trade market where you have placed a sell order or someone dropped a buy order for it, then I am not sure how ethics come in. You are just simply trading anyway !