I think he meant the note that came with the Cloak that said to not trust Dumbledore since he’ll take the Cloak from Harry. which he didn’t, and then said:
But you and I are both gamepieces of the same color, I think. The boy who finally defeated Voldemort, and the old man who held him off long enough for you to save the day. I will not hold your caution against you, Harry, we must all do our best to be wise. I will only ask that you think twice and ponder three times again, the next time someone tells you to distrust me.
And considering that he wrote the note, and set up the mistrust in the first place...
I think he meant the note that came with the Cloak that said to not trust Dumbledore since he’ll take the Cloak from Harry. which he didn’t, and then said:
And considering that he wrote the note, and set up the mistrust in the first place...
Hence, Magnificent Bastard.