Your quotes here are from Acts 10, where Luke tells us everything that Peter said. In Acts 11, Peter is defending himself to the Jewish Christians, and he says that the Holy Spirit came upon them "as I began to speak". If he had just begun to speak, he had not finished saying everything that is recorded in Acts 10.
*** If he had just begun to speak, he had not finished saying everything that is recorded in Acts 10.***
Look more closely...
"While Peter was still saying these things, the Holy Spirit fell on all who heard the word."
"...all who heard the word."
They HAD heard "the word" - the technical term for the gospel.
The had heard, they had believed and they received the Spirit. They were saved.