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The article says: "online trackers can’t easily connect the browsing", which seems to imply that they can still connect the browsing. Why can't they be completely prevented from tracking other browsing. The second question I have is how is this different from Firefox profiles?

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They can still track you through your IP address, or by a combination of many browser/computer/OS properties available through JS, for example window size, browser agent, OS, fonts installed, etc. All these things don't identify you by themselves, but with enough of them you can build a fingerprint which is (almost) unique.

Firefox Profiles function like a multi-user experience whereas Container Tabs function like a single-user experience that only looks like multiple users towards the internet. So, for example browsing history, bookmarks and add-ons are not separated by Container Tabs.

Also, you can (obviously) use them in tabs, not just in separate windows like profiles.

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