I looked a lot like that as a teenager while going through some growth spurts. I ate like an elephant (1990s taco tuesdays at Taco Bell we’d each get a 12 pack after school), but I was still 150-160 at 6’3” (60 something kilos and 190something cm).
This person might be a little lighter, but I couldn’t put on muscle to save my life back then. Not till I was in my 20s did I get above 170.
In High School I was a 5'9" burly 165 lbs dude I was doing like 25 pullups on door frames, but after that life kind of went sideways and I lost the weight and strength and I've never been back to that weight again.
I did continue to grow to 5'11" tho so thats a consolation prize.
but I was still 150-160 at 6’3” (30something kilos and 190something cm).
150-160 lbs is definitely not "30 something kilos". It's more than double that, around 70 kg. Just FYI or for any other weird-unit users out there who aren't familiar with standard kg. 😅