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"Go places a strong emphasis on its applications staying up to date with the language, in contrast to the fragmentation in the .NET and .NET Core ecosystems"

This seems to be bit of an overstatement. C# as a language is stable and .NET and .NET Core aren't that apart from language standpoint. They had different focus through different set of built-in functionality that each framework has provided but with bit of overlap.

There are some libraries that support one but not another (although, for many of libraries, it is non-issue as they are often targeted to .NET Standard which supports both) but to call it "fragmented" sounds a bit too much.