EDIT: Original claim is left intact for posterity, but it is definitely wrong and I misremembered.
Reddit has its moderation oddities but claiming they target the left more is bordering on silly. r/WatchRedditDie is a great catalog of politically biased moderation.Here's a list of subs banned that day with active user counts:
https://www.redditstatic.com/banned-subreddits-june-2020.txt
Chapo was the largest by a large margin besides /r/darkhumorandmemes (edgy jokes).
And you are just straight up lying about /r/chapotraphouse2. It was banned the same day, as was /r/chapotraphouse3 through /r/chapotraphouse49.
"On February 26, 2020, Reddit administrators removed a number of r/The_Donald moderators "that were approving, stickying, and generally supporting content in this subreddit that breaks [Reddit's] content policy" and called the remaining moderators to choose new ones from a list of Reddit-approved individuals. About the same time, Reddit placed r/The_Donald in "Restricted mode", removing the ability to create new posts from most of its users. Since then, some users of the subreddit had moved to theDonald.win, a separate site based on Reddit's old user interface."
https://en.wikipedia.org/wiki/R/The_Donald
From Heavy:
https://heavy.com/news/2020/06/the-donald-subreddit-moved-to...
Reddit admins did the same to Chapo before it was banned too. They replaced a bunch of their mods, chapo just kept going though, with some new rules and stricter moderation to try and stay unbanned.