Wasn't the gist of their story the methods used by Chinese intelligence, rather than accusations that a particular politician (like Swalwell) was compromised? Basically, the story suggests that rather than try to gain a connection (through sexual activities or otherwise) with say a member of Congress, the idea was to gain connections to vast numbers of unknown, low-level politicians, with the hope one or more of them may one day rise to power?
Sort of the same approach used by every 20-25 year old woman in a town where Single A minor league baseball or Power 5 football is played.
Personally, I think they'd have had more luck just going straight for the Congressmen. I don't think it's that hard to get them to do something stupid, so why waste the time with a city council member in Modesto.