Are you saying Blinken spoke out of turn?
I don't think he spoke out of turn in terms of accuracy of content, but I think he could have said it differently in terms of diplomacy in relation to Poland. To say they have the "green light" may have put Poland on the spot, as they were moving more toward a red light.
He also said that the U.S. was "considering" backfilling newer fighter jets to Ukraine if Ukraine moved forward with providing their older planes to Ukraine. That was accurate, as the U.S. government had been publicly stating this possibility for awhile before Binken said it.
In the end, I think they both didn't handle it well, Poland with their blind-siding of the U.S. with their announcement yesterday regarding sending the planes to the U.S. airforce base in Germany, and Blinken with putting Poland on the spot.
ETA All this is just my opinion, based on the MSM news coverage I have been watching carefully on this issue over the last week or so.