The heresy for which these priest were excommunicated was not that they were communicating their flock under both forms, but that they believed that unless one received both it was invalid.
The Church held that Jesus is present fully in either, therefore, one need receive only the Host to be in full communication.
Sorry, the word is communion, not communication.
So you follow your church’s teaching, thinking you have salvation in the teaching of the church.
I’ll stick with the Bible.