Everyone is really overexaggerating I would say. There were huge dips in the past and we can't really deny that, people are free to say it like that because it was real and true. Those huge dips were a great opportunity for us to grab some bags with cheap price and then you had a chance to get a bigger profit when it's the right time in the future. There will be always some of those in the future as well, you can't avoid that.
Those people like OP that say it's not about the DIPs, or about buying those DIPs, are those same people that denominate their capital in fiat. DIPs, and buying those DIPs, would truly matter if we denominate our investment capital 100% in Bitcoin. The more you buy the DIP as a buying strategy, then the more units IN Bitcoin you'll HODL.
What he is saying is people only think about the dips when there is also a pump that occurs. It makes them afraid to invest because of false beliefs. They can trust fiat more because it's physical and already been here for a long time. If ever they already invested in crypto or other assets, they will convert it immediately because of their worried mindset.
In investing, dips are important because this makes us to buy cheaply and it will now be easier for us to see a gain this way. When investing we should only invest what we can afford to lose and it's also a good idea to diversify. We still can profit buying at highs and then selling at highs, as long as we HODL tightly.