The article indicates a 50% reduction in area for a given inductance (last figure). These are planar spiral type inductors found on RFICs, which they're saying

The article indicates a 50% reduction in area for a given inductance (last figure). These are planar spiral type inductors found on RFICs, which they're saying take up potentially 50% of the die area. So overall pretty impactful if you can lop off 25% of your die area.