ECS CLI GnuPG verify "BAD signature"

I'm following the instructions for https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ECS_CLI_installation.html and am following the step to verify the ECS CLI.

In step 2 I retrieved the key from the key server:
shawn@Shawns-MacBook-Air ~ % gpg --keyserver hkp://keys.gnupg.net --recv BCE9D9A42D51784F
CQAKCRBQ3szEcQ5hr+ykD/4tOLRHFHXuKUcxgGaubUcVtsFrwBKma1cYjqaPms8u
gpg: directory '/Users/shawn/.gnupg' created
gpg: keybox '/Users/shawn/.gnupg/pubring.kbx' created
gpg: /Users/shawn/.gnupg/trustdb.gpg: trustdb created
gpg: key BCE9D9A42D51784F: public key "Amazon ECS ecs-security@amazon.com" imported
gpg: Total number processed: 1
gpg: imported: 1

Then I downloaded the signature for the CLI and attempted to verify it, but it fails and the instructions don't say what to do about that:

shawn@Shawns-MacBook-Air ~ % gpg --verify ecs-cli.asc /usr/local/bin/ecs-cli
gpg: Signature made Tue Dec 22 05:40:02 2020 +07
gpg: using RSA key DE3CBD61ADAF8B8E
gpg: BAD signature from "Amazon ECS ecs-security@amazon.com" [unknown]

I know I can just ignore it, but what's the point of verifying if only to ignore the results?

Thank you,
shawn.