Rybolovlev was the seller, the question is who is paying him and who did he buy it from for $127 million in the first place? At this high a price it seems more like money laundering than painting the tape, but who knows.
Rybolovlev and Bouvier have been in a legal battle over their business dealings (including the da Vinci sale): https://en.wikipedia.org/wiki/The_Bouvier_Affair
If you want to read a long-form story on Bouvier (which does touch on this situation), I'd recommend this: https://www.newyorker.com/magazine/2016/02/08/the-bouvier-af...