Domain: Singing (especially theatre/musicals, but not just)
Link: Excerpt, full interview
Person: Philip Quast
Background: He played Javert in the 10th anniversary rendition of Les Mis.
Why: Philip Quast’s has probably done the best performance of Javert, and in the interview he goes through the process of how he figures out how to sing his songs.
The article you cited has a paywall, so I cannot read it for myself, but Reddit says it’s bad, and I’m highly skeptical myself. Wikipedia also doesn’t mention any critique that comes anywhere close to what you describe, not even on the talk page. I also tried to search for such criticism somewhere else, and didn’t find anything. So I’m confidant that this is wrong, and that the way I described Leopold is largely correct.