I did a little digging and found this story from 2017 where the Ecuadorian president admitted to meeting with Manafort.
Ecuador Admits President Moreno Met with Paul Manafort in April
And here's another story about it from the AP
Correa says Ecuador leader must explain Manafort meeting
Neither of the articles State whether Manafort met the Ecuadorian president at the embassy or in Ecuador or somewhere else but now it is much more believable that manafort that with Assange!