You me or any investor who intentionally pretends to wait for the dip season is his not an long terms investor but just a gambler just as you have said waiting for the dip can indicate lack of commitment to consistent accumulation, relying on the prediction an waiting for the market downturn can lead to speculate and gambling rather than informed investing from long term investors sticking to consistent accumulation plan,regardless the market downturn helps you to be consistent and discipline.
I think you are being too emotional about this because I don't see how buying the dip amount to gambling. Do you even know what gambling is? Where is the risk of losing money in buying the dip that will make it the same as gambling? We I will give you a little history about my personal experience.
There was a time Bitcoin was stocked in a range popularly called "don't wake me up" then and the average price was around $26k. They we knew that there would be a major move but what was not clear was if there will be a dump before the major move or it will continue rising from that range so what many people did that time was to set buy orders at lower prices like $20k, $18k, $16k and so on base on individual choices. Lo and behold, the price dropped to below $18k towards $16k before it quickly reversed and started rising and got to $29k and upward. Those who succeeded in setting these limit orders were waiting for the dip and they got their orders filled. That is not gambling because assuming the price did not dump and continue to rise, they would have till used the same funds to buy, just that they will be buying a little higher which is not still a bad idea. I am not saying that you have to adopt this method, stick with the DCA method that is easy but don't call buying the dip gambling because even now there are people who have even kept like 10% of their investment money incase Bitcoin get to $74k. They are buying with the DCA method but that does not mean that when price drops they will not take advantage of it.
I think what he meant when he referred to buying the dip as gambling is waiting for the dip to happen before buying that's the major gamble, maybe he didn't state it clear to your understanding or you didn't understand him, buying the dip method is not wrong but what's wrong is waiting for the dip before one starts investing on Bitcoin, it's like gambling cause what if it goes the other way round and Bitcoin didn't dip as expected but pumped rather.
There's a difference between someone that's been investing using the DCA but still buys the dip with spare funds whenever it occurs to boost their portfolio, it's called seizing opportunity while it lasts and more better compared to someone who has to wait for Bitcoin to dip before buying it, I've heard about some people who would only wait for the halving season for Bitcoin to go very dip, before they start buying, that's not wise, someone with a long-term goal and target wouldn't consider that, except they're only buying it for short-term profits which is not wise as well.