I've heard this term "new and shiny" used many times as a derogatory term.
"New and shiny" implies that there is no real value in the newest tool, that it's just a trend for hipsters to follow.
IMO developers rapidly move to new tools and technology because they are better - simpler, more full featured, easier to use or take a new approach that solves problems in existing approaches.
The "celebrity" suggestion here appears to be that sheep like developers just go and do something ecause some known person has built something. This suggests that developers are stupid. Who has time to learn something only because of the name of the developer? Developers use things because it makes sense to do so.