Do customers get a reminder if they have not yet left a review using Link Mode?

Yes, customers get a reminder if they haven't left a review.

When editing your Get Reviews template — in the ‘Positive feedback step’ and ‘Negative feedback step’ — you can choose to send a reminder email 48 hours later to any customers who left feedback but did not subsequently click through to leave a review.

Please note: These reminder emails are only sent to customers who have opted in to marketing communications when leaving feedback.