Hi there,
No, not necessarily the example was just for the NimBLE stack.
The point is the same connection parameters apply.(what’s supported by the lib)
Most notable are the “Connection Interval, the Peripheral Latency”
see if you can set those prior to the Advertise portion
HTH
GL 
PJ
BTW; I would get it working , then try the other Xiao, prove the concept and then refine in and get the LOWEST power consumption you can (Nrf52840 @ uA’s Sleep) batteries can last years.