Yes, Henry the Update button has been removed in order to encourage the usage of new SOAP integration wizard. You can upload the updated WSDL file in SOAP integration wizard in order to create the new/updated rules into the application in same base ruleset version or in higher ruleset version depends on your requirement. So you can follow the resolution suggestion in your shared link to apply your updated WSDL changes into application.
If you want to do it manually then you can create the Rule-Admin-Product rule using Designer Studio > Application > Distribution > package wizard to create the RAP file and import it into the another environment.
By the way as this is the different requirement i would suggest you to create a new post from next time onwards.
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