Just a hint…
In your case, I’ll try to remove the filter
remove_filter( 'gform_validation', array( 'classname', 'validate' ) );
Rename classname with the class name where the filter is.
And add your filter and functions
add_filter( 'gform_validation', 'your_validate' ) );
If you want to access to another class (and public function) : classname::validate();
Hope it helps
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