And this post right here will prove why it’s not. Literally the next thing Jonas posted in the very same thread.
So it’s nothing like your TV saleman analogy. This would be more like the sales person saying the manufacturer is hoping to upgrade it to colour, add Dolby Digital 5.1, etc… but that same sales person clearly warning you that you should only buy the TV if you’re happy with what it currently offers.
All exisiting Plus customers are allowed to keep what they purchased for the full term they agreed to when they purchased it, that is not misselling in my mind.