It seems obvious to me that it's not, because if you asked a human to guess what comes after "today" in a text, they'd never say "probably some gibberish about a day a day".
Garbage in, garbage out? The preceding text is gibberish, so the prediction will be worse. Presumably they also only show completions with a much higher confidence threshold.
Maybe: "Today was fine. Since I've retired, I'm taking my life a day a day".
Or maybe I wanted to express myself in the timeless words of the poets:
"A day, a day of glory! A day that ends our woe! A day that tells of triumph. Against our vanquished foe!"
"Rose is a rose is a rose is a rose. Loveliness extreme.
Extra gaiters. Loveliness extreme."
"A-well now, everybody's heard about the bird, everybody's heard about the bird, About the bird, the bird, bird bird bird, Haven't you heard about the bird? Don't you know that the bird's the word?"