The information asserted in the article is incomplete at best. I am assuming that it means that this person submitted an application for a word mark, and that their application satisfied all of the legal requirements for issuance, and that the mark was then published in the USPTO's Trademark Official Gazette (TMOG) for opposition.
I assume this because the opposition period is the only thirty day period in a trademark application timeline. The extension request could be innocuous, and though it probably evoked some stress in this Amazon employee, I really don't see an assertion of this active trademark against the application succeeding on the merits. It may be an attempt to pad hours, or it could be a pusillanimous mouthpiece who is afraid of every image of potential dilution that they see in the mirror.
Either way, am I reading this right, that it was just a letter? Well I suppose they can be scary. But opposition is typical in trademark applications, which leads me to believe that the applicant may be representing themselves pro se, or worse, have an attorney that has no idea what they are doing. Either way, I suppose it is entirely appropriate to leap into the sewer of the attention economy and cry foul! Kotaku, you bastion of veracity, can you believe this shit?!
Alright, back to lighting those torches!