RobTop is most likely bug testing http://geometry-dash.wikia.com/wiki/Update_2.1#Trivia Look at the bottom of the trivia
Hi RobTop. It's been 3 months since the initial 2.1 release date, and nearly a month since the last "sneak peek". A delayed release is to be expected, since you are the only one currently working at RobTop Games. But to not communicate or update us in over 3 weeks is completely unprofessional; especially with this massive and impatient fanbase. Take however much time you need, but please update us on the situation. Some are even going as far to assume you're either hospitalized or dead at this point.