Does this actually do anything?

The project says it's compatible with Drupal 10, and suggests the latest version of Feeds, but when I enable it, create a feed, and select a product type, no mappings are possible.

When I check the code, I see that bits like this:
class Dimensions extends FieldTargetBase implements ConfigurableTargetInterface
refer to non-existent classes, and I suppose they're just way out of date.

Am I missing something, or should this just be deprecated for anything past Feeds (of some version)?