The error he committed was to take the meaning of a term or phrase in one part of the Scripture and apply its use there on another portion of the Scripture. In some cases that is valid. In most cases the comparison can help understanding. But in all cases the context in which a term or phrase is used determines how the author intended the reader to understand his choice of words.
Isaiah 30:4 – 5 compares God and His actions to both a Lion and a flock of birds. Using that teacher’s logic since Satan is referred to as a roaring lion in 1 Peter 5:8, Isaiah must be comparing or equating God to Satan. Obviously not. Further Isaiah’s use of the bird metaphor does not expect the reader to see God’s actions as evil.
Comparison of one passage to another is a core principle of solid Bible study. Forcing terms to mean the same thing in all instances where the term or phrase is used, is not.