Yeah mini-LED is kind off a transition screen technology, because what you’re talking about is micro-LED. micro-LED are much smaller than mini-LED and are controlled individually, not with a local dimming zone, so it’s much closer to OLED than mini-LED regarding true blacks and contrast ratio (less blooming). Apple will probably get there in a few years but micro LED is a too expansive technology for now.
That said, 2500 dimming zones in a 13 inch display is a pretty big jump compared to other current mini-LED devices (including Apple’s own 6000$ Pro Display XDR, which has 600 dimming zones for a 32 inch display).