is bleach episode 310 filler?

As Captain Mayuri Kurotsuchi prepares to bring the Real Karakura Town back to the Human World, a Shinigami, running up to him, says a material transfer without the aid of a Senkaimon will be dangerous, since there are still Shinigami there. When Mayuri says he will give them ten seconds to activate the Senkaimon, the Shinigami try to escape, but, giving up, beg Mayuri to give them more time.

Meanwhile, Captain Retsu Unohana, having healed all of the Visored, cannot predict if Hiyori Sarugaki will give up living or not. When Shinji Hirako thanks her, Unohana calmly tells him she is just merely healing her allies.