I was wondering about this when I read the blog post, so I checked out www.dtrace.org and from my point of view its ambiguous.

The front page says:

"DTrace is a performance analysis and troubleshooting tool that is included by default with various operating systems, including Solaris, Mac OS X and FreeBSD. A Linux port is in development."

Then it lists blogs.

¹https://d.pr/i/3DAB5x