I don't think it is though. The NES Classic sold 3.6 million units as of june 30th 2018. It was regularly out of stock at retail while it was in production, and heavily scalped on the secondary market. Nintendo could have easily sold quite a bit more if they were interested in maintaining production, but by September 2018, Nintendo was pushing the NES games as a perk of Nintendo Switch Online paid subscription.
So you are right. My bad. Please ignore this part of my post