Agree with earlier comments about secret diplo at the very least. But those two same name accounts look like the same person.
I just had a look at Scorpion1959, the General account. It has played a lot of games with
Ranger Niko 50 or
Rui Gomes 20. That general account hasn't played in a number of years, but the relationship between these 3 accounts looks suspicious. Scorpion1959 wins the majority of games that they play together. They could just be from the same country and all know each other. The only time one of them doesn't win the game is when either one is taken out first, so they can't collude with each other. That's a bit weird to me.
The new account Scorpion59 has the same kind of relationship with Rui Gomes as the previous account.
If they aren't all multis, there has to be some secret diplo happening in those multiplayer games.