What does this website acheive?

It got you to post it to Reddit. Is that not an accomplishment?

Probably testing if php is running. Making a random string and posting it.

hah, some dude's test site made it to reddit.

It highlights the absurdity of going to trouble of writing anything while being so careless as to spell "definitely" wrong -- as so many people do when posting on the web -- by going to trouble of creating a website using a url that spells "definitely" wrong.