The short answer is yes; however, there are some details to consider that do not affect measurements in silica fiber.
There are a few differences between standard telecom grade fused silica fibers and hollow core fibers. First, hollow core fibers have a lower group index of refraction (1.00 instead of 1.47) and lower (or even absent) Rayleigh scatter levels than silica fibers. If the instrument cannot observe a consistent Rayleigh scatter level from the fiber core, it cannot measure distributed IL events based on drops in the Rayleigh scatter level.
Secondly, it can be difficult to couple standard telecom fibers to hollow core fibers without a large Return Loss event because of the large difference in the group index. These bright reflections, coupled with the finite Return Loss Dynamic Range of the instrument, may increase the noise floor to the point where making meaningful RL measurements is difficult.
However, if these two differences between hollow core and silica fiber are overcome, Luna's instruments can still measure time-of-flight delays, distances (based on the appropriate group index), and the RL of connectors with components. We expect that bend loss events and cracks/breaks will still show up as RL events, even if we can’t see corresponding drops in the Rayleigh scatter level.