He was in Spainworkingbecause that’s his job as a photographer.
Olga had to give up her job, perhaps he should have considered the same. Perhaps she should have left their son with him whilst she had a travelling career?
Furthermore they were divorced and he didn’t live with Olga and Dylan anymore because that’s what they and the courts agreed on. His responsibility was to uphold the divorce decree requirements. No more, no less.
Not living together and living far away from your high needs child are two separate matters.
Besides, in August even if he had managed to convince authorities it was an essential trip to fly back, he’d have had to isolate for two weeks before he could go to their house anyway. He wasn’t in a realistic position to help personally.
He made lifestyle choices over the care of his child in a way the mother could not. I'm not getting deeper into this. We all know this is the truth of most women when a couple have a child with high/specialist needs, especially when they split. This issue is far beyond just this awful story, and reflective of more hidden horror stories when it comes to women's lives. It needs to be recognised as systematic injustice against women and their children, though this particular thread is probably not the place.