Nickelodeon is slowly getting rid of both of those channels so it doesn't really matter anymore. Plus, promos for simulcast say that both Nicktoons and TeenNick count as Nickelodeon and not separate channels.
This isn't the first time, it's been few years that title card has been edited out. I guess it's Jul 2015 according to wikia though sometimes wikia might be wrong...
Also Jellyfish Jam title card was also edited out
During Mysticons on Nick Jr., the TV Parental Guidelines is the same font used for the defunct NickMom block and not the one that Nick Jr. is currently using which was previously on Nickelodeon from 2009-2017. View attachment 119101
Also, another error, when the "Jimmy Neutron" episode, "When Pants Attack" aired on Nicktoons last night, the on-screen credits was the credits from the movie, as "THIS FILM HAS BEEN RATED G" appeared before the correct logos (O Entertainment, DNA, and 2009 Nick Prods.) was shown..