By the whole judgemental attitude in the first few games. It's about a whole match. The guy is proving himself again and again.
You yourself have doubted him in the past.
People such as Phil are perhaps too negative, but it's just the way they express themselves, everyone is different. It's hard to doubt Phil's credentials as a devoted fan if he gives up a lot of his free time (more than 95% of the memberlist here, might I add) to write articles for the site. His reaction at GSM says it all.
Just because someone sees the glass as half-empty, does not make them any less of a fan.