Rentahamster
Rodent Whores
So an English speaking alien race with an idol TV show is okay, but them visiting Earth in 2015 is where you draw the line?
I think you're missing the point. What we have here is the distinction of implausibility from a plot/writing/drama context vs the distinction of implausibility from a world-building/lore context.
The context that precipitates the main plot in Get Schwifty seems a little too disconnected from the main characters, relative to how the plot is set up in other episodes.
This is entirely separate from the concept of crazy shit happening as part of their universe. This is a staple element of the show.
In other words,
vsan English speaking alien race with an idol TV show
them visiting Earth in 2015
are different elements. The former being the accepted ridiculousness of the scifi/fantasy lore of this show and the latter being one of the plot devices that drive the story forward.