This skin set is not being handed out anymore so the dates are not irrelevant now since it was only to celebrate last year Pro circuit event. I think you’re under the wrong impression that the skin is still given out as same time as last year, it’s not unfortunately bud.
Though, they haven’t set a time schedule / tasks to complete to get them skins, but its usually watching the weekly esports streams on live.gearsofwar.com on Wednesdays. (forgot the time when it starts though)
The re released the normal Phantom skins a little while ago i don’t know if it was every skin but i know i have two hammerbursts and retros for the normal Phantom. If they put those back out they may do the same with the Emerald and that other Nuclear one.