From the linked page:
"Lensing approach to the Hubble constant
The current expansion rate of the Universe is parametrized by the Hubble constant, H0. Different methods of measuring H0 produce results that disagree with each other, which could be a sign of new physics or of systematic errors in the methods. Jee et al. have analyzed two gravitational lensing systems to determine their distances (see the Perspective by Davis). They use these as benchmarks for a measurement of H0. The precision is not sufficient to resolve the debate but does bypass some of the systematic uncertainties. Observations of more lensing systems will be required to narrow down the value of H0."
this provides some perspective on what the study was attempting to do, to measure the Hubble Constant using a new and different method.
The abstract of the article:
"Abstract
The local expansion rate of the Universe is parametrized by the Hubble constant, H0" role="presentation">H0
, the ratio between recession velocity and distance. Different techniques lead to inconsistent estimates of H0" role="presentation">H0. Observations of Type Ia supernovae (SNe) can be used to measure H0" role="presentation">H0, but this requires an external calibrator to convert relative distances to absolute ones. We use the angular diameter distance to strong gravitational lenses as a suitable calibrator, which is only weakly sensitive to cosmological assumptions. We determine the angular diameter distances to two gravitational lenses, 810−130+160" role="presentation">810+160−130 and 1230−150+180" role="presentation">1230+180−150 megaparsec, at redshifts z=0.295" role="presentation">z=0.295 and 0.6304. Using these absolute distances to calibrate 740 previously measured relative distances to SNe, we measure the Hubble constant to be H0=82.4−8.3+8.4" role="presentation">H0=82.4+8.4−8.3 kilometers per second per megaparsec."
So, what the authors have done is develope a new method to determine the Hubble constant, which has resulted in a value that would lead to an estimate of the universe's age that is in the lower range of the current estimates.
This being science, others in the field will read and test both their model and their data, which will be the subject of other future studies.