Unless it's a dealer trying to pass a Lusso off as a TI, I don't see the big issue. There was a Guy on here not so long ago with a high mileage Lusso that he'd nurtured and it was a beauty. He'd basically made it into a TI, but the joy of it for me was that it had the full cream interior. I love TI's, but when I think back to my old 33 with it's black carpets, black headlining, black half leather Recaros, although the cabin was 'sporty', it always looked dirty inside and was quite a dingy place to be. When I've sat in TI's I feel like the cabin is awesome, but to live with it for 10 years, I would much rather have the full cream interior.
My point is if I was in the market and someone was selling say a 50-70k miles Black Lusso sportwagon with TI skirts, 19's, silver wing mirrors, cream full leather (dash and door cards too) and 15k miles old lowered suspension, I'd much prefer it to a TI and would be happy paying the same price as an equivalent mileage TI. I've tried to price up converting a Lusso to TI spec, it costs more than buying a similar mileage true TI, generally down to the wheels and tyres, but if you get the car that you want to keep until it drops, then there is a lot of sense in it. It's not like we're talking about wearing a fake Rolex, or worse a real one.