"golden hour" was built in public. Jake Lawson wrote and demonstrated much of it on video, piano-first, and the finished record reached the American top ten in 2022 and charted across Europe, an unusual route for a song that is essentially a piano ballad with a key change as its main event.
He had a following before it. "Upside Down" charted in 2020, "This Is What Falling in Love Feels Like" performed well ahead of the breakthrough, and the album around "golden hour" reached the American chart. He has continued releasing and remains a considerable presence online.
The streaming ratio sits under 3, below the 5.0 mark for a certified one-hit wonder.
So the answer is no. As with any artist whose career is only a few years old, the figure is less settled than it would be for an act from the 1980s, but the current spread across his catalogue is healthy.