Yes - the idea that the Phonecians made it that far is just conjecture. Some even thought they might have circumnavigated Africa, but no-one knows or will likely ever know.
My guess is that, given their boats (made from reeds if I recall) weren't terribly seaworthy, they wouldn't have made it round the Cape of Good Hope - and one wonders why they would have bothered to go that far.
From memory it was the Portugese (Vasco da Gama) who made the first recorded trip around the Cape to present day Mozambique before turning back. I recall that was in the 1500s.