Earlier quoted context omitted.
When you have one thing to nail and already own a hammer, why go and buy another one? Even if it's not a good one, it's gonna do the job, and be the least trouble.
The choice of package manage is much stickier than the choice of hammer. I can trivially change hammers between projects or even between nails. Changing package managers is a lot more involved, and gets more involved as it's used more---and they've just established a precedent for using npm to package go binaries.
Not a big deal at all.