Urgent: PHP 7.3 compatibility

Is this plugin 100% safe and compatible with PHP 7.3? When I ran a PHPCompatibility test using PHPCS, I got the following two errors:

666 | ERROR | Since PHP 7.0, functions inspecting arguments, like
| | func_get_args(), no longer report the original value as passed
| | to a parameter, but will instead provide the current value. The
| | parameter “$tag” was changed on line 664.

694 | ERROR | Since PHP 7.0, functions inspecting arguments, like
| | func_get_args(), no longer report the original value as passed
| | to a parameter, but will instead provide the current value. The
| | parameter “$tag” was changed on line 692.

File: simple-lightbox/includes/class.utilities.php

I am running this plugin in my website for a while which is hosted on PHP 5.6 but now have to be migrated to 7.3.

NB: PHP Compatibility Checker plugin says ‘Unknown’

I am in a bit of urgency with this. An early response would be highly appreciated.