A statement
X is Y.
is transformed to a question
What is X?
A statement
X consists of Y.
Becomes, after the insertion of "do support"
X does consist of Y.
And as a question
What does X consist of?
In your examples, Y is the quoted phrase "acting dumb".
So the native speaker made a mistake when they said "What is X consist of". This kind of mistake is not unusual in unprepared speech.