Yes, this is correct. We have had an icon of Metropolitan Andrey Sheptytsky without a halo for nearly 20 years.
Many of us though, have seen iconographic representations of secular figures, so- called "renewers of society", which are controversial.
While I tend to admire people who strive for social justice, beauty, and peace; I feel uncomfortable seeing them portrayed in iconographic style, halo or not, especially when they were not members of a church which respects and/or venerates icons.
With Best Wishes!
Stefan-Ivan