The phrase "as he highlighted" is correct and usable in written English.
It can be used to refer to something that someone has emphasized or pointed out in a previous statement or discussion.
Example: "The report was comprehensive, as he highlighted the key findings that were crucial for our understanding of the issue."
Alternatives: "as he pointed out" or "as he emphasized".
Miliband indicated that he was unlikely to adopt new immigration policies as he highlighted the policy changes he had introduced.
Corbyn said Cameron's joke was not much use to children losing out on childcare as he highlighted the problem of over-sized classrooms.
Cameron did his best to remain cheerful throughout the day as he highlighted the importance of promoting trade through an African free trade area.
Cameron told reporters that his tour of EU capitals before the summit had been a success as he highlighted the need to secure protections for non-eurozone countries.
Gabriel Weimann, a professor of communication at the University of Haifa, said he was struck by the fact that Mr. Netanyahu did not mention his Likud Party as he highlighted accomplishments of the past four years.
Republican Gov. Larry Hogan pitched a new campaign promise Tuesday as he highlighted a Maryland law that will soon give state employees 18 weeks of paid parental leave — the most generous such benefit in the region.
Now, off the court, he is building bridges to his more conservative former colleagues even as he highlights the fault lines among them.
Cameron uses the announcement to burnish his credentials as a progressive as he highlights the Tories' opposition to ID cards and detention without trial.
We stop frequently as he highlights the figurative elements in David Hancock's photographs of the cave paintings and their stories – curious, poignant, some wryly humorous – of first contact between explorers, miners, hunters and the Indigenous Bininj people.
After a lifetime of differing football experiences, he was immediately struck by the gust of fresh air FC United provided, as he highlights in this reflection on his first FC United match in on 26 January 2015.
