it's definitely an exploit, there really is no question, because it forces the golems to attack a player who can not be reached and therefore breaks the encounter. If you are part of a party who practices this, SE may ban the entire party, even if the healer is the only one who supports the exploit. It has been explicitly stated by SE that if you complete a boss using an exploit then you will be banned, the correct action would be to immediately use the return function and reset the boss. This of course depends on SE not being wusses and actually enforcing their own rules, so far I would say they have 0 backbone.