[WP Smush Pro] Smush PRO no longer compatible with Offload Media (Offload S3)

Smush Pro trows a Fatal Error related to Offload S3 integration:

PHP Fatal error: Uncaught Error: Call to undefined method Amazon_S3_And_CloudFront_Pro::is_attachment_served_by_s3() in ../wp-smush-pro/lib/integrations/class-wp-smush-s3.php:265