That is very strange - I've not seen anything like that before. There doesn't appear to be anything strange about your system other than running under VMWare. I know there are 1000s of rclone users using 18.04 as it is the last LTS and I haven't had any similar bug reports.
Maybe some rclone -> kernel -> VMWare interaction. The kind of thing that is really hard to debug alas
I don't know whether you can attach a virtual serial console and make sure the kernel logs go there? You might get something out of the kernel as it dies. I've used that technique on physical machines with hard lockups.
I don't know whether your video was of the actual console of the machine - if not it might be worth looking at that.
You could also try Magic SysRq on the normal console. It is a little difficult to access so practice before the lockup!