Possible meanings are 1) Paul uses the words "visions" and "revelations" to mean the same thing in hendiadys for emphasis. AT: "things that the Lord has allowed only me to see" or 2) Paul is speaking of two different things. AT: "secret things that the Lord has let me see with my eyes and other secrets that he has told me about" (See: [[rc://en/ta/man/translate/figs-hendiadys]])
Paul continues to describe himself as if this happened to another person. "I do not know if this man was in his physical body or in his spiritual body"