I'm offering a direct answer to your question because I think nobody else did, yet (I might have missed something - that sometimes happens, too). My answer is "No - it doesn't matter". As a matter of "terminological exactitude", the flag pattern is just a specific and fairly readily recognizable instance of the price action that constitutes a post-retracement, trend-resumption entry. As is the case with other price action, there are various different ways of identifying those (examples would be "patterns" and "indicators"). However you identify them, they're a pretty good thing to be able to identify. Post-retracement trend-resumptions are only one way to enter trades, of course, but they're a pretty good way, overall.