Rotation does indeed allow for heavier neutron stars, the outward force helps counteracting the inward pull of gravity that would otherwise overcome the forces

Rotation does indeed allow for heavier neutron stars, the outward force helps counteracting the inward pull of gravity that would otherwise overcome the forces that keep neutrons not turning into black holes. edit: There is a relativistic limit, as faster rotation eventually is not possible without adding ludicrous amounts of energy that would make the neutron star too heavy. The non-rotating limit is about 2.1 solar masses (2.1 to 2.9), the rotating limit is about 20% higher (2.5 - 3.6 solar masses)