There was an Austrian passenger in 3rd Class called Wenzel Linhart, who did not survive. But I suspect that the man you have in mind is Rudolf Linhart, who was interviewed long ago by Radio Prague and claimed to have worked on Titanic as a waiter. There is no record of any such crew member on board. Linhart's colourful story included memories of the crew sleeping in hammocks, and of the officer in charge of his lifeboat shooting people in the water. He obviously had a lively imagination.