Flickering light, Lumotec IQ Fly Senso Plus with SON hub-generator
Since it is an halogen light (correct me if I'm wrong), there is a socket inside, with a spring or something, where you "screw" the lamp. Maybe the spring got weak, there is some rust, or some other sort of bad-quality electrical connection.

Since the lamps are meant to be replaceable by the user, you could do it yourself perhaps without any tool, or perhaps with a small screwdriver or some sort of tiny plier.

If you are in doubt, you could take the light to some friend or shop to take a look inside, for obvious bad-connections caused by rust or misalignments. A simple cleaning would do it, the lamp connections are always quite similar.

The forum refers to adjusting the light angle, twisting the whole headlight, while it could be too tightly fixed on the bike. That would mean the headlight outer casing and/or internal structure got a little bent and misaligned. A movement in the oposite direction coud straighten things back to normal, perhaps.

Hope it helps.