We don't know specifically who placed those announcements in those papers. That they appear is not under dispute.
If they were placed as a normal administrative function of a hospital in Honolulu, then that argues convincingly that Obama was born at the place and time that he claims.
If they were placed by a relative of Obama's, say by his grandparents, then they are meaningless.
This is why we need to see his long-form birth certificate.
“If they were placed by a relative of Obama’s, say by his grandparents, then they are meaningless.”
No they are additional contemporaneous evidence that Obama was born in Hawaii in early August 1961, not in a hospital in Kenya!