There's more to acid than just saying something contains acid. There's the Ph, (Per Hydrogen, IIRC) which is PART of the equation to figure out how strong the acid content in question. The other part of the question is how much acid there is in solution, or molality. Coke (and most cola beverages) contain so little phosphoric acid that the Ph is very low, but the acid is a weak solution. It can be countered by a very small amount of a base solution.

Coke doesn't have enough acid in it to remove rust, dissolve teeth, or any of the other scary claims made in the statement.