What does it matter? Peter did neither did he?
Even when he was having the vision, he still wouldn't kill and eat the unclean animals. If God's intent was to have Peter kill and eat the animals then Peter was guilty of violating a direct commandment of God almighty Himself.
God did not say one word about Peter not killing and eating the animals in the vision BECAUSE that's not why he sent the vision. He sent the vision to cleanse gentiles. Two entire chapters, Acts 10 and Acts 11, are devoted to what resulted from the vision...the cleansing and inclusion of the gentiles in the church.