That is from the Code of Canon Law! Canon 2314: § 1. All apostates from the Christian faith and each and every heretic or schismatic: Incur by that fact excommunication.
This is completely in line with the traditional teaching and practice of the Church, not to mention what was explicitly taught in Satis Cognitum.
Quoting canon law? By this definition, you are excommunicated.
From Commentary of the New [1917] Canon Law .....
1168. The faithful are in conscience obliged to profess their faith publicly whenever their silence, subterfuge, or manner of acting, imports an implicit denial of their faith, a contempt of religion, or an insult to God, or scandal to the neighbor.
A baptized Christian, who calls himself a Christian, yet obstinately denies or calls into doubt any of the truths to be
believed by Divine and Catholic faith, is a heretic;
If he abandons the Christian faith altogether he is called an apostate;
If, finally, he refuses to be subject to the Supreme Pontiff, or to have communication with the members of the Church subject to the Roman Pontiff, he is a schismatic.The Catholics shall not enter into any dispute or conferences with non-Catholics, especially public ones, without permission of the Holy See, or, in urgent case, of the Ordinary. (Canon 1325.)