From reading the article, about some foot pain, and then later a pop in the heel... I had something exactly like that and it was a torn plantar facia.
Obviously, I am TOTALLY speculating that this is what LW has. IF it is, here was my experience:
3 days zero weight on it. 30 days in a walking boot (they considered casting). Then physical therapy for a few weeks. It basically has to heal itself, surgery is much more invasive and the outcomes are essentially no better so they rarely do surgery. It didn't really hurt a lot, but you could not really put weight on it and walk normally at all. Took a while to get back confidence in it to jump or push off on it. I would guess it was probably 60 days before I felt confident to go back to TKD and do anything athletic. Obviously LW is younger and will have ideal medical care, and is probably in better overall physical condition than me lol. So hopefully he will heal faster. And maybe it is a less bad tear, mine was pretty bad.
The PT is really easy - they will have him doing lots of calf stretches to take strain off the PF, plus some toe-clenching type stuff, moving up to standing jumps and the like. Not a painful course of PT compared to lots of other injuries.