There is literally a million ways a person could insult that comment, but let me try to be more mature about it and say.... because it doesn't work that way. I strongly suggest before you start trading, you figure out why it doesn't work that way.
you know... um... Man, what to say to that? High road, high road, no insults, take the high road...
Ok my polite answer is, the word annualized in the investment world means that's how much you've made on an annual basis over a certain time period. One month, one year, 50 years, it's a common practise to annualize those results so they can be scrutinized in a more uniform way.
So yeah, 68% annualized over 4 years is a geometric compounding. It's about a 700% return over the 4 year period, 10,000$ becomes 80,000$, or simply put, 68% annualized.