While you are correct in what you say, it is worth noting that this is designed for specific applications, which limits its applicability. Furthermore, if someone knows how to handle systemd, they can replicate some features of Process Watchdog. In the end, whether it is better or not depends on the situation and how the bot to be used is implemented, as it is not an integral solution.
There is no case that systemd can handle but processWatchdog cannot. It is not for specific applications, it does not limit its applicability at all.
You can use systemd to restart crashing applications and you do not get any stats on it.
I think you should read the github repo before commenting.