Disclaimer, I’m not a dev nor part of the dev community
If it’s styled how they like it, has all the tests/documentation/etc that it’s required to have, I don’t see why they would accept it.
I think the PR means that they do not plan to use their own resources to create the feature. Not uncommon among any project.
This reminds me of an unrelated issue where they said they would write a feature if they received corporate sponsorship (ie, $$$$) to do so.
Best case scenario is to ping the issue (or open a new related issue), ask if they would accept the changes and if you did all of the leg work.