I think you don't comprehend the point at SuperBitMan is trying to make, he is not totally saying that it's not good to wait for a DIP, but he is talking about starters or rather beginners who wants to start investing in bitcoin. Just like the price of bitcoin is now, there are some folks who might want to start investing in bitcoin but may consider the price of bitcoin as high and will want to wait for the price to DIP before they can start accumulating so those are the people that SuperBitMan is talking about and not those who already owns a large amount of bitcoins in the custody and may have been satisfied with the amount they are hodling and ONLY looking for an opportunity to still acquire more when the price DIPs.
In all, whether a beginner or someone who already owns investments in bitcoin, so far as they still find the need to buy more bitcoins, waiting for a DIP may not be necessary and besides with the use of the DCA strategy, they can still meet an opportunity to buy at a DIP price within the intervals of their accumulation stage.
Bitcoin is for the long term investment not for short term. There are people who get excited whenever something goes up whether its stock market or any other trading market. They invest with the mindset that since the market is going up, we can invest our money and take profit in short term. Today Bitcoin is at it's peak and same people think that it's right time to invest in Bitcoin since it's going up and will profit in short duration.
Bitcoin is at 100k right now and those who want to invest in Bitcoin can follow DCA strategy to start there journey. Lump Sum is also effective in long term (Please check
https://dcacryptocalculator.com/ to compare results of DCA with Lump Sum).
Bitcoin is not about buying the DIP and sell when it's high. You must have a strategy that guides you how to accumulate Bitcoins in the long run. Bitcoin price may goes up or down but in the long run it's the most profitable investment.