You probably don’t speak dutch :
Home Assistant does not take over anything. Running a custom integration is not related to the Core, there is no migration path. Custom integrations are not supported by Home Assistant.
You can stay on the HACS version if you want, you can also delete it and use the version from the Core, or even use both. What you do is your choice.
Whether the HACS version will continue to exist and be maintained by Tuya is unknown. I see that question a lot now, but it is something that one should ask Tuya. We at Home Assistant have no influence on and/or knowledge of this.