That's obviously where he got the domain name idea then and did a trademark the following year.
Remember the days when you could find a word that wasn't registered as a domain?
Even the fact he went for the .org leads me to believe the .com had to be in use already. Yup, registered and paid parking since 2002. Interesting he didn't bother to try to use the trademark to grab the .com
You can claim a trademark as long as no one else has already claimed the same name in the same context. Once you have established the trademark, you can prevent others from using that name, even if they have been using it for a long time.
Note that the "same context" is why there's unlikely to be a conflict with Gaymers Cider. In particular, the gaymer.org trademark only applies to social networks.
(IANAL, so I may have some details wrong here.)
You can prevent others from using it in the field the trademark was registered for to identify a product or service not approved by the trademark holder.
Most statements of trademark law being ridiculous for allowing people to "own" common words hinge on ignorance of these details.