Our plugin does not support 3rd party review plugins so unfortunately, reviews using those plugins will not make it to the review feed generated by our plugin. Only the reviews left directly on your website will.
Reviews submitted with Site Reviews are left directly on your site.
The experimental setting in the Woocommerce Reviews add-on filters the WordPress comment functions (i.e. get_comments, get_comment_meta, get_comment_date, get_comment_author, etc.) to return the review data. From my tests here, all of the comment queries and functions that are used by the “Product Feed PRO for WooCommerce” plugin are being filtered correctly when that option is enabled.
However, only reviews that are assigned to published products will be shown, so maybe check that.