Nope...fanfiction.
Uzumaki's were actually targeted in the past. To the point of having to go into hiding.
That 'Filler' is Kishimoto's doing and he did it again with that 'Uzumaki family' page.
When Kushina came into the village, her name wasn't a well respected and famous name.
At that time, Uzumaki were no more famous, they hid succesfully.
Nowadays, nobody knows about the Uzumaki clan, they only remember Senju Hashirama, and they forgot Mito (who was probably kept hidden because she was a Jinchuriki, explaining why nobody remember her, they didn't know her existence) and Kushina.
Kushina was hidden because she was a Jinchuriki, and then she was hidden because she was pregnant, that may explain why nobody remember Kushina Uzumaki as a boss.
Before the villages, ninjas kept their names as secret as possible, look at Madara and Hashirama relationship.
To make a village, the leaders had to reveal their names so that the ninja village would be known as the alliance of Senju, Uchiha, Sarutobi...
After Tobirama and Hashirama, the Senju clan was famous around the world.
That may be why Tsunade has kept her name hidden (and maybe Jiraiya too, Orochimaru too?).
That may also be why Hiruzen decided to name the kid Naruto Uzumaki, that may be why Hiruzen decided to name Minato "Namikaze" and not the name of his "famous" father (Minato is the only one in the manga with that name, the Namikaze clan is made of: Minato).
Kushina was Yin and had no affinty with Yang, Naruto was said to have Senju genes, what if it is Minato who has the Senju (Yang) genes?
Hiruzen's generation had fun naming the children with unfamous names.