honestly i think its in the child era because it has both majora's mask and part of the twilight shard (midna's helm) along with a shard of the twilight mirror. p.s. about them mentioning skyward sword that was the first game in the timeline so it makes sence it was brought up, but i dont think it happend right after skyward sword but insted way in the future of all the zelda's but not that far.