The patriot act is not really “a law” in the sense of being a concrete series of statements you can point to in today’s US Code. It’s more like a patch to a codebase. At the time it was passed it (like any statutory act of Congress) created and amended dozens of sections of the US code. Some of those provisions had expiration dates which have lapsed, but not all, and (apparently) not the sections this article discusses dealing with financial crimes.

I believe you have misread the comment. In 2015, it was expanded and extended until 2019. After that, it was allowed to expire and was not extended or expanded further.