In 2018, 56% identified as 'Ladino' (i.e. Spanish-speaking, non-indigenous mestizo/white),
That seems low, I've seen much higher figures in older (as in 70s and 80s) literature (65-70%), is it due to assimilation of people who are of overwhelmingly (or even fully) indigenous descent into the Ladino population, massacres or emigration?
In Bolivia there are lots of people that have a bit of European ancestry that are still "culturally indigenous" aren't there any of those in Guatemala? I seems a bit odd if the race and culture divide align perfectly.
