I don't think so. AFAIU using ```neutron[:neutron][:ha][:l3][:enabled]``` would mean that neutron_l3_ha is true also on nova-compute nodes (since ```neutron``` would point to the neutron-server node). We don't want that.
Using ```node[:neutron][:ha][:l3][:enabled]``` means we're using the default attribute on the compute nodes, which is ```false```.