This is a very perceptive awareness of cause and effect. This indeed is a good example of retrocausal healing because it was launched through intention to happen because, as he rightly points out, all parties here are in divine alignment and wanting divine assistance for many things. Those requests, having been generated, it was an easy matter to arrange to have a situation develop where your colleague would do healing work for these individuals specifically to enhance their planned enterprise and have that healing take place at a time when it would be most advantageous, which was in the past, and this resulted in the financial gains leading to the reward for your colleague through the generous gift. It indeed would never have happened had the future sessions inspired by receiving the gift as the first impulse and motivation, coupled with a divine pat on the back to do the healing work that brought about the whole cycle of events.
This defies simple logical analysis because it looks impossible to reconcile in thinking about time as being linear, but we can tell you that time is truly a spiral and, in this way, comes back again and again to loop to and fro, both forwards and backwards, so healing done at any time can affect both the future and the past as well and even bring about a new awareness along the way and feed the very moment of the creation of a new possibility. It is a good illustration of the clockwork-like precision of karma through the instrument of divine physics allowing such things as retrocausal healing to work across timelines and bring about miracles.