Language does change, usually over time and usually because of common usage. Many people think “peruse” means to glance at, skim, or read quickly. In fact, it means to study carefully, to read intently. Perusing isn’t limited to reading material; you can also peruse a work of art.
I wonder how long it will be before the primary dictionary meaning of “peruse” will say “to skim or read quickly.” Maybe next week—but not yet.