2021 could be a crucial season for Luke. His mediacal exemption expired in February 2020 and he used his " career earnings" exemption for the rest of the year which is a one time exemption.
The PGA did announce in May that "Due to circumstances related to the COVID-19 pandemic that resulted in 13 events from the 2019-20 PGA Tour season to be canceled or postponed, the PGA Tour has extended eligibility for exempt 2019-20 PGA Tour members for the 2020-21 season, unless the member’s priority ranking at the conclusion of the 2019-20 season would rank higher in the updated eligibility categories. ". From this I gather Lukes exemption will last this year as he is playing in "The American Express" this weekend.