The titles can be removed only by an Act of Parliament.

In his statement Prince Andrew has said -

"I will therefore no longer use my title or the honours which have been conferred upon me."

He will no longer use them.

I do wish the media would give closer attention to the words of the official statement.
Link https://www.royal.uk/news-and-activity/2025-10-17/a-statement-by-prince-andrew