In most comic storylines, Jimmy Olsen isn't a guardian. He's more often involved in reporting and assisting Superman rather than having a guardian role.
The Olsen Twins, Mary - Kate and Ashley, started their acting careers at a very young age. They were cast as Michelle Tanner on the popular TV show 'Full House'. Their cute appearance and natural acting skills made them quickly gain popularity among audiences. As they grew up, they ventured into the fashion business, creating their own fashion lines which are quite successful. They have also been involved in various philanthropic efforts over the years.
Since I don't know the details of the Alek Olsen story, it could be about his personal achievements, like if he's an artist, it might be about his creative journey, his exhibitions, and the inspiration behind his works. Or if he's an athlete, it could be about his sports career, his training, and his victories.
I'm pretty sure it's not real. There's no concrete evidence or reliable source to confirm its authenticity. It could just be a story someone came up with for entertainment.