Please. They don't tease a new show by accident, or on the hopes alone. They also don't increment the Enterprise letter without some solid buy-in from the network. Legacy is happening.
Literally no one but Terry Matalas has "teased" anything, and he's been very open about the fact that there's no movement whatsoever on it becoming a reality.
Maybe it a marketing psy ops ? Like they pretend Academy is a thing so well be haoouet when they "cancel" it and annonce production for Legacy? They already did the same with S31 and Strange New Worlds.