I was responding to the OP statement (and source with 2021 as the last data point) that "Viewership growth seems good".
Lockdowns were in 2020, not 2021.
Yes, April 2020 gave a huge bump to Twitch and the pandemic obviously had a large impact on the following years. Twitch had really good growth.
But look at the sources I linked. Looks to me like viewership has been down every year since 2021.