It should be pretty easy to identify the software that has been used. I don’t have something created with Captivate but both Lectora and Storyline write something like “Generated by: Lectora Inspire 17.0.6” or “Created with Storyline 360” into the source code of every file. Or just ask the vendor which one was used. But indeed a timeline feature is not directly pointing to Lectora.
If you wanted to create a timeline in Lectora you could use a (silent) audio file and animate your page through events. If you pause the audio the page will pause as well. The audio player comes with an inbuilt “progress bar” that can be customized.