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comment by Mindwolf
This is a "Meta" study. Meaning that they pulled data from a database and ran the study off the data. They were studying differences between preterm birth (PTB), and small-for-gestational-age (SGA) births in women that had the vaccine and those that had not. While it's not a full study and not blinded it is free from bias as they are looking at data and not the opinion of the mother and doctor.

Not to say that you are not correct, though. A full double blind study that confirms this result would be ideal.