Actually alosso's first reply was correct - it is by invite only. To simplify it for you, they chose who is bestowed that honour and no-one outside WGT knows what criteria that may entail.
The subsequent retorts were a play on the veil of secrecy the company has, if that was too subtle for you then I apologise.
And I do not live in the forums, far from it. I read them periodically during the day when I have some free time or need a break. I usually will try to help players, but some simply do not have the intelligence to decipher advice from a quip at WGT.
Edit - I believe there are 2 Tour Champions with this title - one being Icon, presumably for testing reasons, the other was posthumously to Phiber.
Regardless the tier systems are flawed as the "averages" are false once you hit saturation in any tier and especially as there are many red tee players (and I am not saying the OP is).
A rethink was required and sadly WGT missed the point when these new tiers were introduced, so they are a title by name but not necessarily by distinction.