Could be that they both decided to make accounts because they had something important that needed saying.
While new/seemingly single issue accounts can be an aggravating factor when you suspect someone of being a troll or otherwise dishonest actor, it shouldn’t be considered suspicious for their first posts/comments to be a completely reasonable take on a controversial topic.
I don’t remember what my first comment on Lemmy was, but there’s a 50/50 chance it was something honest about a controversial political topic.
The other 50 are 30% chance of trying to be funny on a meme post and 20% commenting on how adorable an animal is.