Anyone see any evidence of this?
Search it on LX website, it comes up as it should.
Searched a random date in July CDG-HKG RT, the total fare for 2 pax is 336.13 EUR higher then total fare for 1 pax.
Is it for all Swiss flights?
From the linked article:
The sale covers flight to Asia, The Middle East, and Africa but there is one caveat: You have to depart and arrive from one of 3 French Airports including Paris Charles Degaulle, Nice, or Bordeaux. However, this fare sale is way worth that minor inconvenience!
Works with BP (and likely UR) for extra savings!