No, they didn't "warp time". They did an extraordinarily precise measurement of time dilation though. The dilation is caused by gravity, i.e. it's gravitational redshift of frequencies of a particular transition of strontium.
So what magnitude of gravitational difference is this method capable of detecting? Is it good enough to use as a gravity sensor to detect seismic shifts, trucks passing by, storm fronts moving through, the moon?
> The team showed that clocks located just a millimeter apart—about the width of a pencil tip—showed slightly different times due to the influence of Earth’s gravity.
The “breakthrough” here is in measurement of time dilation.