Fair enough point, but still mostly irrelevant because such an insignificant portion of the population knows the original meaning; Solas, the Sentinels, potentially the Inquisitor.
So even excluding the specific act of reclamation, the only meaning a symbol can truly have is the meaning those who see it will recognize.
Not if their meaning of it would change if they understood the truth of it's origin. 'Ignorance of' is not the same as 'irrelevance of'- the test of which would be the impact of the revelation. If the Dalish were to learn the truth of their past, it would undermine a number of the central narratives and shared understandings of their culture and history. Even if some double down and refuse to change, others would acknowledge and question themselves and their direction as a society and almost certainly change as a result. Different clans will respond in different directions, and the ongoing fragmentation of the Dalish culture will only accelerate. That would give it a good degree of relevance, would it not?
A relevant fact is one which would change people's perceptions, opinions, and actions if they learned it. An irrelevant fact is one which, even when known, makes no difference. Considering Dalish reliance on cultural narratives and oral history, and that giving the truth to a Dalish clan does spark a change in policies, I have a suspicion that this is going to be a relevant fact.
How much so, admittedly, can only be determined by actually revealing the truth to the population as a whole and waiting. But a truth which would have impact if revealed is not irrelevant, even if the population would be ignorant of it- that relevance is why people go to great lengths to hide 'secrets.'