Doesn't change the fact of being there first, with a rich standard library, and one of the ecosystems that drove the design of rich developer tooling, decades before Go was even an idea.
No on claims Go was "first"; I don't get why you're so obsessed by that. The previous poster just said "The race detector is an invaluable complement". And it is. There was no comment at all about any other language; it just says "this is a nice thing about Go".
If you don't like Go then fine, no problem. Everyone dislikes some things. No hard feelings. But why comment here? What's the value of just stinking up threads like this with all these bitterly salty comments that barely engage with what's being said? Your comments alone consist 13% of this entire thread, and more if we could all the pointless "discussions" you started. It's profoundly unpleasant behaviour.
The Go community is quite deep into it being the first into fast compilers, co-routines, slices, static compilation, and rich standard libraries.
The commenter said more than that.
"In general, Go tooling makes up for a lot of the intrinsic issues with the language, and even shines as best in class in some cases (like coverage, and perhaps tracing too). All out of the box, and improving with every release."