I can imagine a government creating a moderate number of fake profiles for use by police and intelligence services, and honestly I'm fine with it, but creating a ghost population for propaganda purpose is entirely different and if you live in a country where you cannot trust your government not to do something that bad, you're already screwd.
In any case, it is still better than the status quo where even foreign authoritarian states can do that in countries where the local government wouldn't.
Do you propose to only let people from a whitelist of countries use internet? Because many countries would have no qualms giving their troll farms bunch of fake electronic ids.
It wouldn't be the internet as a whole, and instead be done at the individual service level (potentially with big plateforms being regulated in what they accept)
And indeed, it is to be expected that some countries be banned from most of the internet, or at least get a read-only version of it, because their digital credentials aren't deemed trustworthy enough. Not unlike how the travel visa system works nowadays.
In any case, it is still better than the status quo where even foreign authoritarian states can do that in countries where the local government wouldn't.