If you listen to the ISS, they are retconning it so the ashes vanish even if you don't defile them. So that specific epilogue tile has basically been explicitly retconned away.
Nothing is getting 'retconned', there is no info about it either way. And even if they wanted to 'retcon' something, it's only of the nonexistent bioware 'canon' (or default world state).
Yeah except that we don't actually know that is what happened and ineed the two epilogues aren't mutually exclusive.They the Urn vanished eventually but they don't state when if i recall correctly. The temple could easily have become a pilgrimage site like the slide says and disappeared only years later (remember there is a decade between DA:O and DA:I). Personally I wonder if the Urn of Sacred Ashes "vanishing" wasn't the chantry moving it away when they decided to use the temple for the peace summit precisely in case something like the breach happened.
There are way more then 10 years between DA:O and DA:I, Yes DA II was in about a 10 year span, but if you read the books (asunder in particular), you know it's more.
Also, if you people haven't read the books, DO SO!!
Mainly 'Asunder', 'The Masked Empire' and 'Last flight' are between DA II and DA:I. And imo are an important read. And if you have the time, begin at the beginning, you wish you would have read them before/around DA:O ;p