No if that were true they wouldn't be stopping development of Deno, which as it stands sits in the best position for codemode given it's granular sandboxing.
Given it's server focus though, I'd be very surprised if it was as good as Deno for giving agents a local code sandbox.
Also another blog post from when the feature became generally available: https://blog.cloudflare.com/dynamic-workers/
I agree it would be an awkward choice for an agent that runs as a local application, but the trend I think is towards agents running more and more on servers.