Yes, it’s legit. @keith was the site developer and has been the site owner and administrator since its inception, but he hasn’t had the time to be able to keep up with it for a while and has recently been transferring over control to @corywright. Included in that process was transferring the Patreon account so that the contribution to site upkeep/development/etc. continue to go to the person actually responsible moving forward.
You can see a bit more about this in the thread that @chuq started mentioning that same email at Changes at supercharge.info