The story suggests that Iwasa, who has fought all 18 of his professional bouts at or around the Bantamweight division, was seriously struggling to make the 118lb limit. Although the excuse has come after the fight it does make some sense with Iwasa now being a 24 year old man and not the 18 year old kid he was when he first turn professional.
In the fight Iwasa looked slow, sluggish and struggled to really find his range or timing. Those issues do arise when a fighter is struggling to make weight and do give some credence to the comments made in the press.
The real proof will be seen next time Iwasa fights. If the reports are true then we'd not be surprised at all if the former Japanese and current OPBF champion vacates his title to move up to Super Bantamweight. He may need to wait longer than expected for a world title fight but the move could well do him the world of good rather than draining down those extra 4lbs and letting the draining take it's toll on his body.
(Photo due to http://www.celes-gym.com/)