it is a rather direct and kind of mean german attempt at humour - it is a direct quote from the text. There is an undercurrent of disappointment with Marco's performance following the hype of his signing which pervades the whole article
I don't think it's disappointment with his performances because there haven't been any and it's not talking about any reserve team games or recent pre-season friendlies - it's more disappointment that he's been injured since pre-season last year:
"Only Rojas broke the right metatarsal, and later had knee problems, which made him miss playing for the first team completely. Is it all a question of the transition from Australian to German football? "No," says Rojas, but certainly admits that the step in the Bundesliga was a great one for him. "The speed and intensity of the game here are much higher than in Australia," he explains. However, his injuries had nothing to do with this. The first came from a tackle, the second a consequence of injury due to a physical imbalance. Either way, Rojas' first year in Germany was sobering. So at least say the statistics: nil Bundesliga games, zero goals, only appearances for the reserves. And yet a lot of confidence.."