No he was not. Get you facts straight or develop enough good will to be honest.
The letter from the Holy Office in 1949 to the Archbishop of Boston (
here) clearly states,
"Furthermore, it is beyond understanding how a member of a religious Institute, namely Father Feeney, presents himself as a "Defender of the Faith," and at the same time does not hesitate to attack the catechetical instruction proposed by lawful authorities".
The circuмstances surrounding the excommunication were printed in an article in "The Catholic Advance" on February 27, 1953, which can be seen
here. Pope Pius XII made three separate requests for Father Feeney to come to Rome. Clearly this meeting was to be about Father Feeney's denial of a Catholic doctrine, but when he did not show for the hearing, this was the final straw.