This is how the story plays out.
TX states that AutoRCM will be a feature of their CFW. Further investigation reveals its a controlled brick designed to boot the console AUTOmatically into RCM. This is both good and bad as we can boot into RCM without a jig but you can't use the console without sending a payload. Then some people got worried the console wouldn't charge if the battery ran out if AutoRCM was enabled which was proven false at around the same day. Console will trickle charge in RCM with AutoRCM enabled even if the battery is "dead". So there were people charging their consoles in RCM with AutoRCM. They were confident it was working as the battery reported higher levels after being charged but consoles were still dying for some reason. The best theory at the time was a falsely elevated battery level which was proven to be true by CTCaer when he tested the charge rates in various states and found charge rate was significantly reduced in RCM with AutoRCM enabled.
While the myth of it not charging in RCM is false, the reduced charge rate combined with falsely elevated battery levels is proof people shouldn't be charging their consoles in RCM with AutoRCM. It was moreso to prove that even if a console with AutoRCM runs out of battery, it will eventually come back to life if it is charged; it just has to be charged longer than normal.
Anyway, this is all documented in this
thread which doesn't provide any new information but bundles all information related to AutoRCM in one place for convenient browsing.