La pétition est adressée à : Das Bundesministerium für Umwelt, Naturschutz, nukleare Sicherheit und Verbraucherschutz

Yes, they still exist and supposedly they cannot be banned:
"A ban on leaf blowers is not possible for reasons of European and competition law. Specific regulations are determined by the federal states and local authorities." The GermanFederal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection.
Despite all the harmful effects on human health, nature and the environment? And climate protection?