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1. Infant Limbo was NEVER a formal established dogma, but a doctrine that Catholics could (and many do) hold. The Church teaches the necessity of Baptism or the effects thereof, but never required belief in Infant Limbo. While Limbo has its adherents (St. Thomas Aquinas, Duns Scotus, Pope St. Pius X), others have suggested possibilities for the effects of Baptism for unborn babies and the very young who have no personal sin.
There certainly was a Limbo of the Just where those who died before Our Lord's Sacrifice had to wait.

2. Pope Benedict never got rid of Limbo. (See below for pertinent text)

https://www.vatican.va/roman_curia/congregations/cfaith/cti_documents/rc_con_cfaith_doc_20070419_un-baptised-infants_en.html

It remains therefore a possible theological hypothesis. However, in the Catechism of the Catholic Church (1992), the theory of limbo is not mentioned. Rather, the Catechism teaches that infants who die without baptism are entrusted by the Church to the mercy of God, as is shown in the specific funeral rite for such children.

This is just another attempt by bad theologians and leftist activists to try to gin up a moral equivalency argument by taking things not in the realm of dogma, and putting them there.