Are you sure? The game makes those 2 sound like people are more likely to show up if they are built.

I've used a lot of resources on them in the hopes that they'd do what was implied they'd do.

I'm somewhat worried. I'm level 42, and I've built and upgraded the lean-in shelter, as well as built the log cabin, and I'm still stuck at 10 people. My campfire is level 3.

I hope when my additional upgrade on both the lean-in shelter and log cabin finish in a few hours, I get more people, as it's maddening to have been stuck with only 10 people for 4+ days (sort of more like 9, as 1 has been stuck on the 5 day community shelter upgrade).