When I was last working in Chile on a SaaS product for use in Chile, we deployed everything to US-EAST. We still had local CDN caching, but it is always nice to be closer to your hardware. I can't tell from the article what types of datacenters these are, but if these are new Azure and Google Cloud availability zones, this will be a great for latency.
Edit: It looks like all the major cloud providers have Chile AZs except Amazon, which has one planned: https://aws.amazon.com/blogs/aws/coming-soon-aws-south-ameri...