The average player today is more skilled than superstars in the ‘90s.
No-names are capable of stuff like this nowadays.
They had 7ft rim protectors on every team camped in the paint preventing these plays in the 90s. So only players who were really capable of posters were putting up these highlights. Now the center is at the 3pt line defending his man, so you get no name players putting up highlights.
Like i said before, Most of the differences in Athletes today are due to rule changes and strategy change. Not people jumping higher, or being better at the game.