They literally set it up in the very first episode that Dan was “gossip girl”. The first edition of the column that we had read to us was about Sabrina being spotted at the train station and returning home. And Dan was the one watching her.
They did put too much stress on the Uni thing only for them to find themselves at Columbia some reason and we did not get too or know if they even graduated
So good reboot definitely wasn’t needed. GG works because of the era people weren’t being exposed in 2007. Also teens today are very desensitized, the scandal isn’t really “scandal” anymore.