Accessing Tale 2,600
Unfortunately, your intuition is correct. It's an unreachable easter egg. Kevin Maroney, developer of the 2nd and 3rd editions of Tales of the Arabian Nights, states in this BGG thread:


  Nope. It's an unreachable Easter Egg, a tradition going back to the first edition in 1985 (paragraph 1400) and continued in the 1999 second edition (paragraph 1600).