HMm i think you are correct i does look like it .. but then why would kishi name it specifically an absorbing rasengan? i do believe though that there is more to it then meets the eye.The Rasengan Vacuum/Absorbing Rasengan isnt a sealing tech, Naruto makes a huge Rasengan with his hand(Looks like he doesnt need 2 hand for an Rasengan anymore) Then he makes a bunch of arms with the kyuubis chakra and drags them onto the Rasengan, It doesnt really absorb you but it sucks that instead of having a Rasengan punched into you, YOU get punched into a rasengan
But then again we cant really guess whats on kishi's mind .. that guy is even more unpredictable than naruto is lol xd