Well, its admin is Russian and joined Lemmy around when the Russia was cranking up its troll efforts in 2023. Or, here he at least claims that he is Russian: https://lemmy.world/post/76070 .
Also, the letter "Z" is used in the Russia in the same meaning as the swastika was used in Nazi Germany. No Russian would call himself "ArtemZ" in year 2023 without meaning that he is proud of Putin. And if you are a big fan of MAGA-ism, why do you choose a nickname that promotes Putin instead of one that promotes Trump?
You can also just read what he has been writing with his previous accounts. And how he first was talking good about the Russia and then bad. Depending on what he figured would work best for MAGAts.