No, they're saying their is an alternative, but it comes at a huge disadvantage. Perhaps not for individual users, as a DDG and Firefox user I'm quite content, but it's definitely an overwhelming disparity for website admins. Even if that admin is not literally in Google Analytics to view their site data (and they probably are), they're still looking at an overwhelming majority of organic traffic coming from Google Search using Google Chrome. And for site publishers and advertisers, Google AdSense or Google Ad[Word]s are enormous.
In 1870, if you wanted to get from Chicago to San Francisco, it would be facetious to claim that Union Pacific did not have a monopoly on that route. No, Union Pacific wasn't forcing you to board their train. Just like you can Ctrl+T over to duckduckgo.com/ or bing.com/ or kagi.com/ in seconds, and never go back to Google. You could avoid the railroad monopoly by 'just' riding a horse, or walking, or taking a boat down the Mississippi and launching a sailing expedition around Cape Horn. That's still a monopoly.