This is good news.
The framing of the organization being called "stop population decline" strikes me as weird given that the global population is far from declining, and either already has surpassed or will soon surpass eight billion. It is true that data is more granular than that: some demographics have more children than others, which leads to shifts over time. All of this is normal and, if not good, at worst neutral. The problem arises when by far the most common voices to say anything about "population decline" or "overpopulation" or anything like that are typically using those terms as dogwhistles for white supremacy/Great Replacement bullshit.
I'll grant that their About page seems to mostly be stuff I agree with, and from a cursory look at their website, I'm not seeing evidence of white supremacy on it. But idk, the vibes are still off for me.