It seems like they took his doctorate due to 'cheating'....yes I know Otto is the one who 'earned' it....and brought in Curt Conners to give him an opportunity for a redo on the work.
But it just seems to have been dropped as a plot line.
Personally I would love to see the current Spidey title writers get together on keeping that as a recurring subplot for about a year in all the books...then have him wow with his presentation doing something beyond what Otto did.