The antennas are connected properly and BT works in windows 10. I tried the same mouse it was detected very quickly!
Also, I tried it with my BT earbuds, work as well.
UPDATE: tested both mouse and earbuds and they work in macOS. Hmm, having BT working in windows activate something?
No. I only see USB 3.0 Bus, and under it are my usb devices. However, I see my broadcom card as:
Product ID: 0x216f
Vendor ID: 0x0a5c (Broadcom Corp.)
Serial Number: 184F32F3F5BA
Speed: Up to 12 Mb/sec
Manufacturer: Broadcom Corp
Location ID: 0x14d00000...