Sure. What I originally said of "it’s not like they did it just once and it was corrected" was in recognition that it keeps happening and has kept happening going back over a century. Maybe that's what the disagreement is here. Do you believe the 1619 Project to be an island instead of a long train? I do not believe the 1619 Project is a solo disconnected island.
In expanded form: Since it keeps happening and has been repeatedly for over a century and there's no very large conservative presence to combat these tactical changes that they make to history, it is going to keep happening in perpetuity for an unlimited time frame. It's been happening since 1913 at a minimum. Without opposition, there can not ever be a limited time frame in the current state of things.
But while the problem is ongoing I also think it's important to focus on solutions to said problems.
I got to thinking that I thought I had seen your username before but I looked at my ping list and I didn't see it there. But I wanted to reiterate, because I think you've seen this and probably know that I do work to try to combat this in the form of audiobooks.
I'm not so bold as to think that any one or the next audiobook is what will turn the tide, but what I do think is that these are tools that we are going to need. Progressives have tools. Why don't we have any tools? Well, we do. I'm creating them. Whenever we do finally start seeing the rise of many conservative historical organizations, what I've created will be important tools in the arena. I wouldn't have put a decade of my personal time into the effort if I didn't think it was something that would be impossible to overcome.
You need to expand your thinking more than that.