He isn't. He's just a Z-lister so pathetic he's willing to do shit like this for whatever they pay and has some residual nerd cred from ST: TNG despite being the most loathed character in it, something he could have shaken off had he not decided to become a perma-Wesley himself irl.How is Wheaton in any way, shape or form qualified to do this?
The best Wesley episode is where he leaves with some space pederast and everyone is like okay, whatever.The best Wesley episode is the one where Picard rips him a new asshole for being a dishonest fuckup and he's subtly written as being gay.
He isn't qualified, but they probably didn't want to pay for someone who's actually qualified.
Fun fact: Ian Fried, who played Timothy, the brother, went on to star in the sequel, and later trooned out and is now a journalist named Ina Fried.