My first thought was why would the Protectorate lie to Taylor to trick her into joining, when they never really seem to use that tactic in Worm? Of course, then I realized I was being stupid. There's no reason to treat the Protectorate as beacons of honesty and integrity. But if they were to trick people into recruiting, why go with a lie that doesn't reflect reality even in the slightest?
Because it probably has a good chance of working with those who are ignorant?
Presumably they would use different words and tactics for someone who had been independent/rogue for quite some time, or with someone who showed signs of great understanding of parahuman culture. But for someone who they know triggered very recently (or somesuch), using this deception could work quite well. And odds are that there are some examples of people having been forced to join. Enough that if the target of the lie questions it then or later, they can mention a couple of names, so its probably not even a total lie, but rather a significant exaggeration of risk.
You know, similar to whats happening in US who are all utterly terrified of foreign/muslim refugees, even though the chance of being killed in a terror attack is absurdly insignificant. Or people who are anti-vaccine. And countless other examples.
Remember, you have read Worm and considered all of this calmly. You are also able to think about it rationally from the comfort of your PC without pressure or worry.
In-world, having a significant authority figure tell you, "yeah, theres a chance that if you don't join the wards, you will be pressganged by horrible criminals", will likely result in fear response and such. Few people can calmly and rationally analyse the political structure of the city and its gangs at that point and realise the chance of risk is minimal. And few people (teens in particular) would ever have considered any of this before.
And once you have joined PRT and become friends with other wards and got the full PR experience and so on, you will likely not care even if you realise you were kinda deceived, since you have made friends and got several nice benefits. Or you will find it too difficult psychologically to quit at that point due to sunk cost fallacy. There are probably legal problems with just leaving too.
So yeah, this is probably one deception that works, but I am sure they have others in the bag for different types of people too.