Also an Airbus pub...
Yep, it's another Airbus publication....the one about buiding ice crystals with low thrust settings with temps colder than -40. No kidding.
Will try to locate it and cite it, but you gentlemen can do a little research yourselves.
Has nothing to do with remembering or forgetting....
And, if you'll read the above-cited Airbus FCTM page, you'll see that, even in climb and cruise, you should use engine anti-ice with temps colder than -40 (if in or around CBs/TRWs). Yep, it's all there in black and white! Again, no kidding!
Fly safe,
PantLoad