Will this be updated to 2.1?

I'm not sure whether this mod will receive a 2.1 update, or when that might happen, based on the author's recent activity.

If you're looking for an alternative that's already compatible with 2.1, my mod Dispose in Liquids provides similar functionality and has been expanded with additional features over time.

Can confirm simply updating the json to request Factorio version 2.1 results in the mod working fine.

There are some new tiles added in 2.1, e.g. oil ocean variation on Fulgora, that won't be working by just bumping the version.

Fair. I was able to work around it by being particular about where I dump. Was already avoiding the ocean-with-icy-bits tiles on Aquilo.