I will install Istio as a service mesh on AWS EKS. I know that Istio provides its own Ingress Gateway. What I am confused about is: Do we still need to use AWS ALB or ELB in front of Istio Ingress Gateway?
Given that Istio will create a Service for its Ingress Deployment of type LoadBalancer, Kubernetes will take care of provisioning the ELB for you. No need to create it yourself although you could also configure the Service to point to an existing ELB.
The linked Service is outdated and for ease of reference only. The latest Istio chart is actually here. You should be able to download it and confirm the Service configuration.