For a claim under this subchapter of disability or death of an employee who has been employed for not less than 5 years in aggregate as an employee in fire protection activities, an illness or disease specified on the list established under paragraph (2) shall be deemed to be proximately caused by the employment of that employee, if the employee is diagnosed with that illness or disease not later than 10 years after the last activedate
of employment as an employee in fire protection activities.