You are almost close.
add_filter( 'some_custom_filter', array( $this, 'filter_suppress_the_content' ), 10, 3 );
// the above line states that, the method `filter_suppress_the_content` should have three arguments, where you have used nothing.
public function filter_suppress_the_content() {
return true;
}
// comparing your code, this method should have one argument
The solution:
public function setup_filters() {
add_filter( 'some_custom_filter', array( $this, 'filter_suppress_the_content' ), 10, 1 );
}
public function filter_suppress_the_content( $false ){
return true;
}
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