Does OnePlus support removing NetFlix?
That screenshot suffices to say that the Netflix app is a permanent bloatware. A permanent bloatware has Disable option instead of Uninstall option. Furthermore, it is not the only bloatware. Many folks consider Google apps as a bloatware too. Regardless, your only choice to get rid of that bloatware permanently is to root the device and delete its APK. Otherwise,  because Disable option is available it should work for non-roted users. However, If you are keen to uninstall the app without root, you can use adb but do know that the app would return after a factory reset. Follow the link here for that method.