At 3 weeks my seedlings are like 3 or 4 times the size and I run them under full blast of epistar blurple from the moment they germinate. I honestly don't see any leaf twisting, or any problem at all. Besides that this plant is tiny for 3 weeks. Maybe it's because the picture is of bad quality. Everything is purple and the plant is sideways.
If my plants get too close to the led it's obvious because the new growth at the top shows the problem. It gets chlorotic and then growth stunts. But that only happens at less than 12 inches with these kind of diodes... And I just dont see any symptoms of that here at all.
Sometimes those little 'folds' in the seedlings leaves just happen they are normal... before they get their 5 fingered ones leaves.
just my 2 cents using this kind of light for veg for 1.5 year non stop.