The account is old but it looks like it was only used for posting for the first time today. Maybe a longtime lurker?

Yeah I'm completely at a loss regarding motivations as well. I understand the need for astroturfing outfits to establish legitimate history prior to usage but the prose are still far too easy to spot to be throwing away old accounts like this one.

I really wonder who is paying for all the wasted effort targeting HN at this early stage instead of waiting a bit for the LLMs to be less discernable.