std::string, const, and thread safety

This question has been discussed but I haven't seen a set answer yet. It's partially discussed here:

https://www.justsoftwaresolutions.co.uk/cplusplus/const-and-thread-safety.html

But the answer still isn't totally clear with me.

If you define std::string const kstrValue = "Value" is kstrValue inherently thread-safe?

What my research has indicated is that it is thread-safe as long as you don't call std library functions that mutate the string.

Is this true?