Considering his only reason for wanting to deactivate the Dragon Balls was because of the greed it provided to mankind, I'd say no. I doubt he would've been told all the details about the Minus Energy at the young age he was when he left Namek. Hell, the majority of Namekians may not have been aware of this due to their aesthetic nature making such warnings unnecessary, especially when the only reported case of Evil Dragons prior to GT was from many galaxies away.