Yep, Jepsen has not only confirmed but later reconfirmed that MongoDB has for many years been on par with other NoSQL databases when it comes to transaction guarantees and data consistency.
Also, "2020-05-26: MongoDB identified a bug in the transaction retry mechanism [2] which they believe was responsible for the anomalies observed in this report; a patch is scheduled for 4.2.8." [1]
"Jepsen Disputes MongoDB’s Data Consistency Claims" - https://www.infoq.com/news/2020/05/Jepsen-MongoDB-4-2-6/