If you can't sustain a contradictory debate, don't bother replying.
I just assumed you were ignorant on that topic (hence the "?"). Nobody called you ignorant.
As far as I know, BA does not edict the laws of physics, do they?
I dont' really care about your company procedures and I never intented to convince you. The OP asked about a MET/physics related phenomenon and you peremptorily answered with your outdated (my opinion) company procedure based on a false statement.
Icing (not supercooled water icing with Liquid Water Content but ice particle icing) can form below -40°c in particular conditions wether you like it or not and crystal icing is a potential threat for aviation ops (and that statement is not from me, it's from Boeing / GE / NASA / FSF...).
[Airbus had many problems with certain pitot tubes, as for the proof, you have google or EASA AD section
]