Your article is from 2003 [1], so when they say "by 2028" they don't mean six years from now.

Since the article was published we've gone from positive leap seconds every so often to looking like we may get the first ever negative leap second: https://upload.wikimedia.org/wikipedia/commons/f/fb/Leapseco...

Which means the article's estimates on how long it will be until we're off by a given amount of time are very much obsolete.

[1] https://web.archive.org/web/20030801000000*/https://www.ucol...