The cited video presents Calamandarin as a mandarin × calamansi hybrid and labels it Citrus reticulata × microcarpa. This tree records the described Mandarin group and the linked Calamondin cultivar only. The exact Mandarin selection and pedigree are not verified; the source does not report cross direction, so both parent roles are unknown.
Source [1]: https://www.youtube.com/watch?v=GM16poNa3v4
World of Citrus