He underwent a procedure where a substance was injected into the damaged cord, which helped him regain vocal function.
While your query mentions 2022, major news regarding Lambert's physical health surfaced more recently: 2022---Christophe-Lambert--the-truth-behind-his-lost-voice
There is no evidence of a widely publicized 2022 "truth" regarding a lost voice for actor . While his distinctively husky voice has often been a topic of interest, recent reports about his health focus on other events. Clarification on Lambert's Voice He underwent a procedure where a substance was