He's 19 in those videos. 99% of young footballers take time to learn their bodies and how to make the most of them. Haaland and Lukaku are literally the only 2 exceptions that did it early, and hence they broke out early. Ibrahimovic, dzeko, Cavani, Lewandowski etc .. all took much longer to start putting it all together, consistently. They showed flashes like Hojlund does now.
Lukaku was and still is weak in duals. That's the issue with him, his game relies on avoiding physical battles otherwise he is cooked. What Lukaku was very good at from a young age was to carry the ball powerfully on the counter, he later added the ability to close the second post and score "easy" goals, basically Lukaku was and is a fast poacher.