Code whitelabeling is a Pro feature. I believe if you pay for a pro account you can omit the Webflow references. I don’t think anyone is going to help you circumvent paying and helping the platform grow. Remove Webflow from Code Feature - #2 by AlexN
Also, Webflow is pretty awesome. I don’t really see why people feel the need to hide it. It’s not like most clients would know what to do with Webflow anyway.