Let me try to answer in a different way.
1) I'm in charge of the FAQ. Over the last year, I've scoured the various LNL forums (Facebook, Consimworld, BGG, this forum. etc.) going back as far as 2004, read every post (10000s of them) and never saw anything about a missing ambush rule for this scenario.
2) I'm currently waiting for someone that still owns Honneur & Patrie to take pictures of the scenario's pages so that I can confirm that there was no such rule in the first edition (I don't own it anymore)
3) I have looked at the scenario and I don't see any need for an ambush SSR. The setup instructions that put the French at a distance of 2-3 hexes of the Soviets, while having the initiative, will result in the French getting a headstart advantage, akin to an ambush 9evwen though the word ambush does not appear anywhere in the scenario
4) I have not actually played the scenario so I cannot be 100 % sure that there is no problem with the setup but I have a bit of experience in playing the game and this, added to the fact that no one has complained about this scenario since 2012 (H&P publishing date) make me pretty confident there is no problem
5) I won't bother asking Mark Walker, the scenario designer, about this; I never got an answer to my last questions and that is OK; it is no longer his baby, and he would probably not even remember.
6) The only thing left I can do to convince you that what you are expecting, based on your previous playing of other convoy ambush scenario, is not there, is to play the scenario myself. I might be able to do this in the coming week and will report on my experience
Have you played it? If so, did you notice a problem with the actual scenario rules, setup, etc. that made you wonder if something was missing ?