I'm not saying this at all. My original comment was a reply to vmurthy whose comment was specifically about discounting a raised price, and my response to him states that I'm commenting about that specific sales tactic.
For the record, I am against any practice that unnecessarily hides the price one is paying or makes buttons confusing and other "dark" UI patterns. However, if the price one is paying is clearly visible, I see no reason to regulate anything else regarding that price, such as x% off or limited time offer or that nonsense.