In simple words, tubeless tyres means, the tube and tyre are not 2 different parts (pieces). The tyre and tube are integrated together and it forms 1 piece.
Im not sure if some of our sales agents understand this, my sister has a wagon-r and when she was bought the car, she was told that the tyres are tubeless type, she wouldnt know as she didnt do any research online to check these things. Later when I visited her she said it was tubeless and I was surprised to hear that, on checking the tyres they are not tubless (Im back to normal thoughts).
Now, did the sales guy lie about it to make the sale happen, or was he not aware of the type of tyre. Cheating, lieing its all a part of this now, Or is it?