A fake Inverto can easily be identified by it's model number printed on the box itself...If you zoom in the pic below, you can see the model number under the box barcode is 3116 which is the fake inverto & being sold on all the sites in India & China...The below pic I took from CATVIndia site itself which you linked before...I already visited that site & they are selling the fake Inverto too...
On the original box (which I have not found anywhere) the model number will be written as 5203...
People who bought this 3116 model have either returned their LNB to the store or stopped using them (when they got to know that it's fake & the site didn't provide any return/refund because the users can't prove that it's fake) because it made no difference on the signal quality & strength compared to their 100-200/- LNB...
I found several people commenting about this on several YT videos...