Where did it come from and how did he do it is my question. 😱
Doing a little bit of research, I've come up with what I believe is the answer. Back in 2016, when the RISE album was being re-issued on Herb Alpert Presents, there was also a digital EP called the RISE REMIX EP. It had six remixes of the song plus the original and was only released digitally. I think the marimba track is from the one called the Randy Badazz Raw Funk Mix. The YouTube poster then used some rather good digital extraction audio tools to isolate the marimba track.