FWIW, that sounds a lot like my V3 does. At idle, there is a small whistle with a light "grind/bee" sound. It goes away with any RPMs, but your 1st video sounds almost exactly like mine does at idle.
I have owned a bunch of Vortech's and install them on customer cars quite often. It sounds normal to me. When the bearings fail the pulley shaft and/or the impeller will get loose and they will grind. They also will not spin smoothly. They will have rough spots as you turn it.