the correct hooks are manage_{$post_type}_posts_custom_column action hook to display the column and manage_edit-{$post_type}_columns filter hook to add the column, so try,
add_action ( 'manage_cpt_posts_custom_column', array( $this, 'cs_show_expdate' ));
add_filter ('manage_edit-cpt_columns', array( $this, 'cs_add_expdate_column' ) );
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