It's fairly rare to have ELW, WW, or similar, around neutron stars in the game but not actually as rare as it might seem like it should be.
As for fast spinning, I'm surprised more of them aren't really, since as far as I know they can actually be rather fast in real life, i.e. pulsars.
On the other hand, there seem to be larger stars volume-wise that spin much faster than they should in real life.
So... yeah. Stellar Forge up to some old tricks, I suspect.
Still a cool find to see stuff like that now and then.
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This is one of my favorite systems I've found so far in the game. Black hole, white dwarf, neutron star, and two terraformable terrestrial water worlds with life, one with a moon. ↓
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But yes, I have also found some systems that are closer to what you described with just a neutron star and water worlds.