is blue lock episode 8 filler?

Team Z managed to hold onto a sliver of hope for surviving the first selection. But the sticky situation never ends, with them forced to play 10-on-11 against the strongest team in the group due to Kuon's betrayal.

Even a draw would make them disqualified, so winning is the only option for them. Under such a circumstance, Isagi goes to meet with a certain someone to attain the secret of the formula for goals, so that the team can win, and he can be a scorer himself.