Not sure what portion of the landing page you're talking about, but I took a look on parakeet and they basically just have the logo duplicated for each section and filled a different color. The logo is then positioned fixed relative to the section so it appears to come out of the previous section.

Not sure if my explanation makes sense, but if you inspect the site, it should be clear.

I think there is a wrapper with contains the logos with absolute position using z-index as well. Each logo has an own container with a defined height. On scroll at a specific position different logo containers opens and closes. Without looking the source.