PHP 7 Compatibility?

Hi, we’re using Photo Gallery by Supsystic on a site we’re planning on migrating from PHP 5 to PHP 7. The site is hosted on WP Engine and we’re using their compatibility tool (https://www.ads-software.com/plugins/php-compatibility-checker/). It is throwing some errors and warnings: https://pastebin.com/R5HvwEkZ. I see some references to PHP 7 compatibility in your changelogs but nothing that explicitly says it’s PHP 7 compatible. I also found a reference on your main site (https://supsystic.com/topic/poster-problem-with-photo-gallery-supsystic/) about this issue but no public message whether this is resolved. Is this plugin PHP 7 compatible?