No, it's not
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You posted an Apache redirect. I stated that I changed my NGINX config to redirect. Are you using the redirect you posted with Apache & Varnish Cache & Nginx Reverse Proxy?
I could not get any http-to-httpswww Apache redirects to work (flawlessly) behind the NGINX reverse-proxy including the one that you posted. Some would loop and some would cause server errors. I'm also behind a web server firewall appliance so maybe that has something to do with it. The NGINX redirects work flawlessly and I believe that's where the redirects should be done since incoming traffic hits NGINX before it gets to Apache.