Yes, he did write these things. But he wrote other things that would argue against deistic tendencies as well. I remember reading what was written on the Jefferson Memorial and being really surprised. His writing that slavery concerned him because we have a just God is not the view of a man who believed that God was passive and no longer involved in the events of man. Jefferson is a complex man and taking a few of his words will never give adequate evidence of the totality and complexity, the nuance if you will, of his thoughts.