The 2019 roster has not been recovered from Slack, Drive, or member records. The 2018 board is documented on Board of Directors 2018, and the July 2020 email ballot is on Board of Directors 2020, so the 2019 board sat between those two.
Missing record: if you have 2019 board meeting notes, election emails, or photos of the board listing, post them in the board channels — this page is the gap in the roster series.