Definitely, definitely not true. Go is extremely fast, it has its strengths in some areas and trade offs in other areas. If you want a good comparison to Apache Kafka, you should look at Apcera's NATS server, a publish-subscribe and distributed queueing messaging system written in Go by Derek Collison: https://github.com/apcera/gnatsd
You should never discredit a language, especially with blanket terms such as "its faster than Go". In what respects and in what areas? Here's a blog post which performs benchmarks on Go and Scala: http://eng.42go.com/scala-vs-go-tcp-benchmark/
They found Go to perform better than scala, however it had a high footprint. Every language has its tradeoffs, Java and Go are no exception.