PHD OPT一年再用master STEM extension 两年？？

第三年phd学生，有job offer，不读phd了,没打算博士毕业，已经是candidate，已经修完了博士的课，听说PHD post OPT一年再用master STEM extension 两年，有了解的人吗？
关于用之前学位STEM extension的说明

USCIS上面 studyinthestates.dhs.gov

To qualify for the STEM OPT extension, an F-1 student must hold a bachelor's degree or a higher degree in an eligible STEM field from an SEVP-certified school that is accredited (by an accrediting agency recognized by the U.S. Department of Education) at the time the student submits their STEM OPT extension application to USCIS.
Under certain circumstances, an F-1 student may use a prior STEM degree from a currently accredited SEVP-certified school to fulfill this eligibility requirement. To use a prior degree to qualify for the STEM OPT extension, the F-1 student must:
Have received their most recent degree (which does not need to be STEM-related) from a currently accredited Student and Exchange Visitor Program (SEVP)-certified school.
Have received their prior, qualifying STEM degree* (at the bachelor's level or higher) within 10 years of applying for the STEM OPT extension with USCIS.
The qualifying STEM degree needs to be on DHS's STEM Designated Degree Program List at the time the student submits their application for the STEM OPT extension, rather than at the time that the student received the degree.
For more information about which programs of study qualify for the STEM OPT extension, visit our eligible classification of instructional programs codes resource page.


Question: 绿字里面的most recent degree请问指的是什么，有了解的小伙伴回答吗？（猜测的话就不用回答了）