I got 5 results, including this thread.
I have to admit I missed the last one: TTS(CE) aka TTN V3 Scheduled Maintenance - Monday July 26th 2021 because I searched on Friday and published my question today (without checking again).
However, there is no answer to my questions about the implementation of LR-FHSS on any device/gateway. Or is there?
Thank you again for your messages