Need your opinion please
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The guy sounds like a RIGHT TOOL!
If it's blue smoke then it's two stroke oil.
That's fine, you'd expect that on a crosser.
If it's black smoke then it's gearbox oil.
If the guy has no visual impairment, and can't distinguish between blue and black THEN DON'T BUY FROM HIM!
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As said, two strokes smoke. So just saying it smokes isn't an indication of how good the deal is.
If it's blue smoke, then at worst the piston rings are worn out.
If it's black smoke then it needs new crank seals.
Neither are really a problem for a two stroke engine to be honest.