That's because a recall or a service campaign is essentially the same for a dealer: all cars in the affected range get the fix, paid for by Hyundai.
The difference (which you may already know) is that a recall is something that Hyundai has to make NHTSA aware of via official letter. They have to give NHTSA every affected
VIN number, and provide updates on a regular basis as to which VINs get the fix. This is how we, owners, can use NHTSA's website to find open recalls.
A service campaign is something that does not involve NHTSA. They do notify owners, or have dealers do it (like the phone call you got).
A TSB is a level below that. Owners are not notified, but dealers use those to know what to do in case of a known issue, or to know if a vehicle is in the affected range on any TSB.
All of these eventually get published on NHTSA's website, even TSBs, but they're notoriously slow (except for recalls). They're 2 to 3 months behind on publishing TSBs, so don't be surprised if this one is not yet showing online. It will eventually.