I'm pretty sure this refers to the Tribunal having reviewed your case using the law and regulations that were in effect at the time of the Decision (to put you in the WRAG), that you were appealing.
This still holds true should you need to appeal a future decision, but the regulations in affect will be those in force at the time of any re-assessment, not those that were in effect at your last one.
Bottom line is that you will not be re-assessed using the same criteria as last time, as they were changed in March of this year.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems