Sounds like a rumor started by a desperate gamer. Why would Nvidia waste resources doing something so dumb, when they make money selling cards to miners?
maybe they want to sell more specially GPU for miners. That would be the best for the gamers.
"Also remember that NVIDIA has recently said that GeForce graphics cards are for gamers, and not miners, with the company already making retailers aware of this."
https://www.tweaktown.com/news/60812/nvidia-block-geforce-gtx-20-series-cards-mining/index.html
NVIDIA is not happy that cards are being taken away from gamers. I wish they would actually make gaming specific cards and mining specific cards because there is a very different supply, demand, and hence equilibrium price for each. I am a miner, and I have 10 GTX 1070s running at all times. But I still don't think its fair to monopolize the supply. Why should gamers suffer because of miners?