webservices I've installed my WP with command wo site create domain.com --wp -le --wpfc
And in the WP Dashboard, I installed the Redis Object cache plugin and the plugin is connected to Redis server.
The docs are not very clear - but page caching and object caching are two different things.
So it sounds like you're using Nginx for page caching and Redis for object caching at present. If you want to use redis for page caching as well then you need to use --wpredis. Or yes, if you don't want to use redis for page or object caching then you can uninstall it.
Anticipating the next question... it depends, so you'd need to test which combination works best for your setup :-)