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My understanding leans on the note Peter said about the right hand seating of Christ, which indicated the Spirit was poured out only due to that seating. This means what they received in Acts 2 was not the same as any experience before the cross.

Also, Peter said Acts 2:38 was words amongst more words of how to be saved from that wicked generation, as Jesus emphasized that generation was doomed again and again in the gospels. So acts 2:38 IS about salvation!

Acts 2:38-40 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. (39) For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call. (40) And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.

Some might think 2:40 salvation was from doom for Israel, which may be the case.

My thoughts anyway.