I think years back the DCA strategy was not effective because the price was kinda affordable compare to now and i believe most investors back then where lump summing, I mean back then one can get some numbers of Bitcoin with $5k but right now it's entirely a different case,
That's not true and DCA is not something that just come out suddenly it has always been here right from the day one of Bitcoin, I don't no how you are seeing it because DCA is not like a physical entity that can be developed like that, so is like a theory that has already been on existence, so it was only left for people to know it and those who knows it then was also making a good use of it just like the way we are currently doing right now, secondly don't think that it was because of how low the price of Bitcoin is then that made people to disregard it.
Don't know why we he assume that its not effective way back then since you just need to be consistent accumulating. Speculation of price is not part of DCA and most provably this one bothers him. I guess he's changing his methods used depends on the movement of market that's why he mentioned something about lump sum strategy.
For me I didn't find anything wrong about doing DCA even since before and its perfectly working good as I see to those people who use it also based on experience.
Also if they get bothered to much on pump and dump thing happening in the market then maybe it can really shift their attention then maybe question if DCA strategy is worth it for them. If they are really for long term then best to stay focus and continue to accumulate.