No, the DDoS High Defense IP service does not automatically add the source IP address to the security group.
DDoS High Defense IP is a service aimed at mitigating Distributed Denial of Service (DDoS) attacks. When configured, it acts as a shield to protect your origin server from malicious traffic. However, managing access control and security groups is typically a separate responsibility that falls on the user or the cloud service provider's networking configuration tools.
For example, if you're using Tencent Cloud, you would need to manually configure the security groups in the Tencent Cloud Console to allow traffic from the DDoS High Defense IP to your origin server. The DDoS service itself only diverts and filters malicious traffic before forwarding the clean traffic to your server, but it doesn't handle the security group rules.
If you need assistance with configuring security groups or integrating with DDoS protection services, you might want to look into Tencent Cloud's Network Security services, which offer comprehensive solutions for managing network security and access control.