Hey Hayden,
Hope all is well.
After your linkedin intro, I couldn't resist using your template and integrate it with the CP Geo cluster.
Found a few issues though:

version = "~> 2.61.0" within the provider block is deprecated, so I added another provider block.
Added also credentials to complete, I know this is not very secure but for demo it should be fine.
all variables start with "yourxxx"

Update the variables according to your requirement!

terraform {
required_providers {
aws = {
source = "hashicorp/aws"
version = "~> 2.61.0"
}
}
}

variable "project_name" {
description = "Project Name - will prefix all generated AWS resource names"
default = "tgwlab"
}

provider "aws" {
profile = "default"
region = var.region
access_key = "youraccesskey"
secret_key = "yoursecretkey"
}

variable "region" {
default = "yourregion"
}

data "aws_availability_zones" "azs" {
}

variable "edge_sg_vpc_cidr" {
description = "Edge VPC CIDR"
default = "10.7.0.0/16"
}

variable "spoke_1_sg_vpc_cidr" {
description = "Spoke VPC 1 CIDR"
default = "10.10.0.0/16"
}

variable "spoke_2_sg_vpc_cidr" {
description = "Spoke VPC 2 CIDR"
default = "10.20.0.0/16"
}

variable "key_name" {
description = "SSH Key Pair"
default = "yourkey"
}

variable "ubuntu_20_ami_sg" {
description = "Ubuntu AMI ID 18.04"
default = "yourami-id"
}