It is scamming if they are falsely claiming benefits for the upsell.
I bought a wireless keyboard (typing on it now) a wireless mouse, a flash drive, and a medium bag of peanut M&Ms at Best Buy the other day, and the guy didn’t try to upsell me on anything. He didn’t even try to sell me an extended warranty on the M&Ms.
Trying to up-sell a customer is not new and certainly not a scam.
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It is when it is being sold on a lie ... the example given is a HDMI cable ... they pass a digital signal ,, one cable is the same as another it either passes signal or it doesn’t , the salesman is lying when they claim that the one that costs 3x more will improve the picture or sound.