This thread is resolved. Here is a description of the problem and solution.
Problem: uploaded .xliff files for spanish translations aren't showing on site
Solution: The page was using ACF repeater and flexible fields and those fields were not configured properly. Configuring it exactly the same as shown in this video solve the issue, the same settings apply for flexible fields:
Relevant Documentation: https://wpml.org/documentation/related-projects/translate-sites-built-with-acf/
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