The chances to find life on planets in No Man's Sky very small?

dinosaur like creature on a planet in no mans sky

I remember and interview with Sean Murray and if I am not wrong, he told the interviewer that the chances that you get to see life on planets are very small. One guy on reddit said that three out of nine planets will have life. I don’t understand how those people get this information.

Does anyone have an idea with a link to an article or video that talks about the probability of landing on planets that have life? By life I mean living creatures, not plants. Thanks.