I was in an earlier match against a three-stack in Survival. After two headshot on Sniper, I suddenly got the message "Contacting Destiny 2 Servers" Despite no lags before this at all, then I suddenly got disconnected, my entire internet just stop working even my discord. Was I ddosed or what?
You may have been. It's safe to assume you were but there's also the possibility that your internet genuinely gave out due to buffer bloat, ISP issues, or general loss of service.