Well, I only speak English but have had experience with "Spanish' speakers that come from south of the border over the many years.
I recall working in a shop where we had a number of guys working who were from Mexico. They all could speak 'Spanish'.
However I remember them having a very hard time communicating with some of our customers who were from south of the border and spoke no English.
Eventually they worked it out but.. took a lot of yammering and a lot of pointing.
The varieties of "Spanish" south of the border appear to be quite diverse.
The SPanish we learned in High School in the USA was Castillian Spanish, quite useless I understand for attempting to speak with denizens from south of Texas border.
I presume the Spanish used in this game is most likely based on classical, aka Castillian Spanish.
If they were to try and convert for all versions, they would go broke.
Hell, I have a hard time understanding some Englishmen as their variety of English is too tilted for my ears (Texan ears) and brain to grok.