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it's isolated, it has no access to the internet but there should be internal routes:
<https://github.com/pulumi/pulumi-awsx/blob/cb9693ae7ca99de21e917d98e8f0d001238ca691/nodejs/awsx/ec2/README.md#subnets>

Do you know how I can confirm there are internal routes?

every subnet gets a default "local" route which will be routeable in the VPC, that's the way the aws networking works:
<https://medium.com/@mda590/aws-routing-101-67879d23014d> see point 2 here