I don't think it is about the the concept of a false glideslope itself but more the autopilot behavior that can result from it.
I guess everybody will be aware of false glideslopes but not the violent pitch up that is the reason of the investigation..…
Is new to me anyway. I would expect a pitch down or high rate of descent on a false glideslope, not a pitch up.
And sometimes you end up high and have to capture it from above. Just happens..