I found this as well while surfing through videos related to Orthodoxy about a month ago. I thought the same thing about how beautiful the liturgy is in Spanish. We recently had a Priest visit our church who was going to Mexico with his family as a missionary. I’m always impressed by people who are willing to go to another country, family and all for the gospel.
The liturgy was all vocalized by the choir - no organ or any other instrument was used even though it sounds like a pipe organ was used.