3번째 조항이 잘 이해되지 않습니다. opt stem extension 중에 volunteer를 해도 120일 unemployment를 까먹는다는 이야기 인가요?

What types of employment are allowed for students during an OPT STEM extension?

– Students granted an OPT STEM extension must work at least 20 hours per week for an E-Verify-enrolled employer in a position directly related to the student’s STEM degree.
– STEM students may work multiple jobs related to their STEM degree, but all the employers must be enrolled in E-Verify.
– Students on an OPT STEM extension are allowed to volunteer, incidental to their status. This means that volunteer work is allowed but does not count as employment for the purpose of maintaining F-1 status.

http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=ff791c491861a110VgnVCM1000004718190aRCRD&vgnextchannel=68439c7755cb9010VgnVCM10000045f3d6a1RCRD

제가 이해하기로는 employment 기간으로 속하지 않기에 unemployment 기간에 합산 될 거라는 것 같은데, 정확한 건 졸업하신 학교 internation student office에 직접 물어 보시는게 정확할 거 같습니다.

발룬티어 기간은 일하지 않는거나 마찬가지란 얘깁니다. F-1 자격을 계속 유지할수 없다는 얘깁니다.