xkcd had a brilliant chart on the ROI of script building: https://xkcd.com/1205/
“Bot” is just a fancy way of saying “script” or “system”. Someone had to develop this bot, and will have to continue updating and maintaining it, as more features are inevitably requested. This is often a more difficult and time-consuming task than the “manual” task that it replaced.
Not to pick on the pmbot example, but a meeting held on Slack can be easily time-shifted. There’s no reason why one should consider the 15 minute block of this meeting to be common time for all participants. The status update given here could be listed on a shared wall or Wiki, and would probably be best served that way.
In short, the reports of the death of human jobs have been greatly exaggerated.