As it is taboo in Vulcan Society...therefore it is only taboo between Vulcans. Using it on a 'lesser being' like a human is fine.
You also have to account for whatever social/political changes occurred in that timespan.
the season 4 episodes of "The Forge" "Awakening and "Kir'shara" seem to suggest Mind Melds where mostly made taboo by the government of Vulcan (who were basicly facists) to supress the actual teachings of Saruk.
Once this government was toppled Mind Melding would logicly lose it's taboo.