that is not the case with none of the drones actually.
You can read here an independent review on Inspire one
Looks like the FPVLR does more than the DBS also on DJI Lightbridge drones
Stock to FPVLR to DBS antenna mod comparison.
Plus it's just mathematical calculation.
the 5.8GHz DBS is only 8dBi linear polarized
the 5.8Ghz FPVLR is 10dBi (tested 10.04dBi in anechoic chamber) LHCP
the 5.8GHz inside the CG03+ camera is LHCP
so you have to take 3dB loss from the DBS 8dBi because of polarization mismatch (it's linear polarized)
8-3 is 5dBi
with 10dBi LHCP you are almost doubling the range of the DBS. You need 6dB to double the range so 5dB will give almost double vs the DBS... simple math and RF engineering basic 101