It looks like you have been trying to purchase frequent reviews on the listing OR inviting customers aggressively to improve the ratings. The current reviews are all negative and sudden attempt to post positive ratings triggered TP to detect those new reviews as fake. At this point, there is nothing more to be done to remove that warning banner from the listing. You can only contact their support to find a solution.
For future reference, always try to mix the reviews between neutral to positive ratings. Maintain decent gap (drip feeds) between each review. Check the profiles properly with their location and past activities. Don't target always to achieve 5 stars ratings. Focus to build a proper trust score in organic way.
