I agree completely,
A bit of fluid in the Gruberi bursa area is a really common finding and I don’t mention it unless they are tender there with sono-palpation.
I think like all bursae, it is a normal structure and can contain a little fluid, however it can also get inflamed (bursitis) and become clinically important.
I look for tenderness and also flow within the synovial walls of the bursa as evidence of active bursitis.
Sometimes fluid in this area can also be from the dorsal tall-navicular joint.
Steve