You're missing the difference in the two examples.
Brisbane were told at 3 quarter time to asses him - they put him back on the ground for the start of the 4th quarter before assessing him.
That’s because they were not yet aware of the notification from the arc as Drs were busy attending to players. As per the AFL statement.
The exact same reasoning that was given by the blues.
They both claimed they were delayed in being aware of the scat6 notification because the Drs were busy attending to players.