Well, as much as it's a fair point that Dua is not a true representation of the country's music, it's also something you could say about all mainstream and industrial music.
Then you have to think what's the extent of it being an accurate representation. Would it work if Dua sang "New Rules" in Albanian? If yes, why? If no, would she need to scrap all of the arrangement in favour of local instrumentation?
Pop music rarely has cultural ties when thrown in international waters, because it has to appeal to the United States and UK. If it doesn't your music career is pretty much country-bound rather than international.
Yes, larger and more influential countries have their own niche of pop, examples: JPop, KPop, Reggaetone (now solidified as pop music from Spanish speaking countries), but for smaller and less influential countries, pop tend to follow the trends of more influential countries, for example the Lithuanian worship of Scandinavian pop and hiring Swedish songwriters to save us in Eurovision.
Another point that you could make, specifically for Dua Lipa is that she didn't grow up in the country she's based from, which is why you can't really expect her to have deep-rooted cultural ties when making music or even the simple fact on how little control she probably has on what music she is making.
But yeah, what I'm saying is that it's more of a smaller country lack of identity in pop music. I could show you 10 Lithuanian pop songs and you wouldn't find a single Lithuanian thing in them, but that would still be considered as a representation of that nation's music, just not the cultural representation, I guess.