50% off exspanion packs on origin but not seasons

i haven't been able to find much information on this since receiving the alert of a new video on youtube. the youtube video says up to 50% off on select expacs/game packs, but the twitter account gives a code for 50% off the sims 4 base game.

so far, i haven't seen any simgurus responding, not even to acknowledge what is happening.