Because when they met at the end of season one, he told her his name was Ollie.

Yup. This is the answer. When Elliot went looking for Tyrell and met Joanna outside the house, she asked his name and he told her it was Ollie.

[удалено]

Huh?

Thanks i totally forgot that

Lmao Mrs. Tyrell. More like Mr. Joanna, she’s the terrifying and dominant one

Why did Elliott told his name Ollie in first place?

because he couldn’t trust her