PHP 7.1Compatibility

Siteground’s SG Optimizer/PHP Configure plugin claims that Smush is not compatible with PHP 7.1.

Is this correct? See error description below.

FILE: ../wp-content/plugins/wp-smushit/lib/class-wp-smush-recommender.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 80 | ERROR | Function name, class name, namespace name or constant name can not be reserved keyword '__dir__' (since PHP version 5.3)
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FILE: .../wp-content/plugins/wp-smushit/lib/class-wp-smush-admin.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 374 | ERROR | Function name, class name, namespace name or constant name can not be reserved keyword '__dir__' (since PHP version 5.3)
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