No reason to lie to prospective buyers.
REPUTABLE sellers wouldn't do this.
No one can argue with that. Many eBay sellers just don't know any better though. We all know that a Talisker 10 bottled 10 years ago isn't a 20 year old, but i see this sort of thing all the time. Often if you check their history there is no whisky sold so many are just ignorant.
Ultimately it's you the buyer that must know what you're doing. Caveat emptor.