OK
I am member of mi 3,4,5 group. I have seen this particular picture of mi 5 with description of exploding whilst charging. Someone replied, explained that mi 5 was hit with hammer.
Personally I believe this mi 5 owner did suffer the problem as described as she admitted to throwing item as well. If my xiaomi mi band 3 exploded I'd do the same. Plus owner reported to many online places, to make people aware. Mi 5 does have a magnetic charge, and I have seen magnetic usb phone charge cables. Maybe research needs to be on the agenda for mag-charge hardware.
Some usb items I have heard by irl by word of mouth do explode, like power banks, phones etc. I hope owner gets money back, plus an apology and compensation for being frightened and damage to affected . I advise owner to purchase mi 3,or 4,as it has a usb cradle charge as mine hasn't blown up YET! Sorry if I seem harsh. ;)