it's a joke at the end of the day. i haven't seen anyone who genuinely believes it should get a 10/10, but it's funny seeing it beat steins;gate, kimi no na wa., and attack on titan.
i don't think it really counts as vote manipulation for nux (don't even know the guy) to say to vote it 10/10. sure, some people might do it because he said so, but i doubt it. i think lots of people are just jumping on the bandwagon as a pose to following nux's orders.
i do feel though that once it's finished airing scores should be reset for people to vote again. it's funny at the moment, but it won't be funny if it's still in the top 5 by the end of next season.
In his video the show sits at 7.64, which seems high still but I digress, and now it is at 9.16. Seems pretty obvious that it is just manipulation, just like when Pingu reached the very top.
It's kinda obnoxious behaviour, even if the score will eventually even out. Atleast Pingu was just wholesome.