From the AR, the following is found concering the updated later production rate at Cauchari-Olaroz:

"Development Schedule

The development plan contemplates mechanical completion of construction, followed by a commission period and then commencement of production. Based on Minera Exar’s current development plan schedule this process is expected to be completed in mid-2022. The current schedule is based on activity levels permitted on site under the enhanced Protocols developed to provide for the health and safety of Minera Exar’s workforce in Argentina during the pandemic, but the Protocol is being monitored on an ongoing basis for efficacy and to respond to the evolving trajectory of the pandemic in Argentina and elsewhere. "

Pretty much what I expected.  The document does elsewhere note that there are 200 and something employees currently at the site and, as we all remember, prior to the COVID-19 situation the on site employee count exceeded 900 at one time.  The Pandemic has definitely taken a bite out of the on site employee population and thus legitimately explains the projected delay, which in itself is based on the supposition that the COVID-19 situation will not undergo a further resurgence which would just add additional delay to the production schedule.