Yes
Claude has quite easily picked that up to add features to it along the way
_heimdall on Hacker News
In the thread “Gemini 4 Argon”, replying to this comment
Helped: Handling outdated tech stacks and adding features.
… I have a client app on a very old (for the JS world) version of eleventy using NetlifyCMS (also outdated). Claude has quite easily picked that up to add features to it along the way.