Turns out "rehab" was hanging out with famously clean living Bruce Smith at his "lakefront villa"...
It's a TV show.
There's no known causal relationship, let alone "50%". Most have been found to be "pseudolipomas"--subfascial fat that ruptures through fascia due to traumatic injury to the latter. Also, even the study you cited (read it) found that the mean presentation time from trauma to the appearance of these lipomas in questions is 2 years. Dareus said his appeared 1 week after his hit.