Yes. Lightroom 6 can create a basic timelapse without LRTimelapse by exporting your image sequence as a slideshow/video and setting a very short slide duration (for example around 0.04 s, which is about 25 fps). So the plugin is not strictly required.

That said, the community answers note some limitations: Lightroom’s built-in slideshow/video output is fairly basic, may default to frame rates that aren’t ideal, and the result can look more like a slideshow than a polished timelapse if the timing isn’t set well. In practice, dedicated timelapse tools or workflows often produce better-looking results and offer more control over frame rate and rendering.

So the short version is: Lightroom 6 can do it on its own, but LRTimelapse or another dedicated method may give you a smoother, more video-like final output.