That doesn’t really make sense to me. Although the charger may be grounded, any device connected is fully isolated and I’ve never seen a laptop charger with a earth wire on the dc side.
In chargers with a ground the negative DC rail is connected to ground internally for suppression. In chargers without a ground the neutral AC pin is capacitively coupled to the DC output for RF suppression, which is what people are complaining about in this thread- the small amount of leakage that capacitor causes.
This is only allowed with an Y rated safety capacitor in most countries, or not allowed at all.
Fake, or genuine, but still bad Y caps are everywhere.