Sadly, the older photos of Arthur acting like a dumbass were further down, and... Well, you know how well Tumblr's design preserves that. There's a reason lolcows are fans of Tumblr, as it goes.
I will, however, confirm that this gem was on it (again, from some time ago), among others, dating back to when he worked for The Phoenix, a School Paper:
There was a lot more of these there, too. Now, thing is, even if you believe that this entire thing was a hoax (and to all involved:
you're right to be skeptical, this is mostly based on third-party sources, and we're dealing with people who lie about
fucking everything), there's the unpleasant truth that
this was signed up for in under Arthur Chu's email address and had a bunch of his photos on the Tumblr (I'm less familiar with the Flickr). So unless this was a
very long con-job dating quite some time, odds are good, given how quickly they were deleted after exposure as well (and how notoriously lax Tumblr is to do much of ANYTHING; just ask anyone who's reported being doxxed on Tumblr) that these are legit.
As ever, draw your own conclusions.