Depends on your definition. Many people try time out and would consider themselves to follow gentle parenting techniques.

Time out & time in are included in the 'Science of Parenting', a book which i think is used by gentle parents.

To the OP, you might find some tips in the 'Science of Parenting', maybe your little one is a bit young for Time Outs, and you could try something else for now. Sorry i don't have more advice.