He is not referring to Dextro1 post but instead to the one written by Cantsay.
3.@Cantsay in a way
admits that what he is doing is a good way to earn merits and advertise his sig campaign.
That si imho a weak explanation. I would maybe believe him if he said that he has that whole post already written somewhere and saved just in case, but to see a new topic and write all this in 44 seconds? I honestly doubt that.
By the way, we had similar cases in the past where some members were doing exactly this: using alt account to create new topics, then answering with main one knowing that early replies usually gets the most amount of merit so this woulnd't be a first one.