This is false. The screenshot is from a pirate site that marks games abandoned after x-amount of time passed, regardless of whether developers can prove a game is being worked on or not. It's just their policy and isn't necessarily an accurate reflection of reality.
As I've said/proven numerous times, I've done quite a bit of work on Polarity Chapter 5, however currently my focus is on Radiant, which isn't abandoned (has received two very large updates in 6 months) and isn't going to be. Polarity's development will be resumed as soon as it's possible and I'll make an announcement when it is.
Fans of the game and those of you who supported me and this game in its infancy, just know I greatly love and appreciate you all!