The plugin adds one more tab to the product card in preview mode in the backend. Tab contains a form to compose a new review with the possibility of specifying the name of commenter, e-mail, date and other fields that are necessary to ensure that the review looked "like real".
Customers are not very willing to be a first commenter, so for new products it is sometimes useful to add a couple self-made.
If you are upset by the ignorance of the authors of the reviews and have a desire to make the review in accordance with the rules of grammar and/or punctuation in the plugin is the ability to edit any review or comment to the review. The edit can be enabled/disabled in the plugin settings.