Yes, rss is still alive. To follow a twitter account in a rss reader you need a rss feed. Twitter does not provide it probably to encourage you to login to twitter.
Charlie Harvey wrote a nice script and hosts it on https://www.twitrss.me/.
Simply type in a twitter account or a twitter search and it will return an url of an rss feed. Paste that url in your favorite rss reader and Bob is your uncle.
Thank you Charlie, for writing this great script and thanks to Bytemark for hosting it.