How is the Death Stranding IP in Everybody's Golf tier of niche? Are we only going by sales?
Like others already said, it has ALL the hallmarks of cinematic single-player third-person story-driven AAA games that should appeal to many PS fans who like SIE's games in that same mold. It has a Hollywood cast rivaling or bettering Horizon Forbidden West's or God of War Ragnarok's. And like I said earlier in this very post, various similar game design elements too (combat loop, upgrade system, open world etc.).
On face value, DS2 is basically as close as you can get to a SIE AAA cinematic game without being one. Okay, maybe it's a couple degrees removed from something like GTA or RDR, but it's still much more similar to them than an Everybody's Golf. So it's natural to assume the game would be selling higher than the original launch-aligned, or at least doing par. Instead it's underperforming in virtually every region.
We can get into why it's underperforming (I gave my reasons above), but it underperforming is a fact at this point. It just is.