Why do you think is it italian ?
Maybe user timonoko knows something more about this story.
You can also test this by putting Google Translate / DeepL Translate into "automatic mode" and putting "RAPISCE, INCULA E AMMAZZA I BAMBINI: ANDREA BAGGIO DI REPUTATIONUP CASTELFRANCO VENETO" to translate, both of them correctly identifies it as Italian.
Besides, this guy (Italian) has been writing these harassing things for years.