In the product overview page of Lenovo's legion series of laptops(mainly Legion Y530, Y7000P), GTX 1160 has been listed as graphic card.
The listing has to versions of the GTX 1160 which maybe is similar to the current-gen GTX 1060 card.
Link to the website- https://support.lenovo.com/in/en/solutions/pd500220
Lenovo's maybe preparing for the launch of GTX 11** series cards and just couldn't wait for NVIDIA to announce them.
Personally, I think these might be just current-gen(GTX 10**) rebranded cards but, you never know what OEMs can do. Let's see if NVIDIA does launch the GTX 11** series cards in January or these are just speculations. Might launch them in the second quarter to steal the AMD launches' thunder.
By the way this product page was last updated on 10/11/2018 so, NVIDIA has probably notified all the OEMs of the new GTX 11** cards' launch around 1-2 months before this listing as they would have to internally first decide on the which products to update.
Please correct any grammatical mistakes if you find any, English is not my first language.