Manual Memory Management in Go using jemalloc

How Dgraph was running out of memory for some users, and how Go’s Garbage collector wasn’t enough, and Dgraph team used jemalloc to manage memory manually, which is a kind of hack.

I have read a ton about the strengths of Go’s garbage collector and how it’s getting better with time. Including the post, Getting to Go: The Journey of Go’s Garbage Collector from the Go blog.

Does the above post mean Go’s garbage collector isn’t as strong as they say?