When I go to see the installation instructions, it doesn’t seem to mention any aws CLI installations?

yep, docs are incomplete. If you look at the source code it's trying to run `aws`: https://github.com/pulumi/pulumi-eks/blob/d599a1b1f3650dba4c3dc4f560080e95ce6fb5b1/nodejs/eks/cluster.ts#L347-L351

try {
        which.sync("aws");
    } catch (err) {
        throw new Error("Could not find aws CLI for EKS. See <https://github.com/pulumi/pulumi-eks> for installation instructions.");
    }

Awesome - thank you!