$this refers to the class “WeDevs_Dokan” most likely.
Replace:
remove_action( 'dokan_new_product_after_product_tags', array( $this, 'add_product_brand_field' ) );
With:
remove_action( 'dokan_new_product_after_product_tags', array( 'WeDevs_Dokan', 'add_product_brand_field' ) );
And see if that works. Sometimes classes are namespaced, so check the file to see if that’s the case and include that before the WeDev_Dokan string.
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