The term "trad-cath-leninist" probably refers to folks like this (unless there's a hardcore Leninist faction of trad-caths socialists that I am unaware of):
I think the exact conjunction is a bit tongue-in-cheek. While there are certainly leftist infighting on Twitter, I don't think Catholicism or pine trees has much to do with it. The joke is that ideological names can be like genre names---ridiculously fine-grained but also absurdly concatenated.
Yeah, I get it was tongue-in-cheek (eg, "pinetree"). I was just explaining who they were referring to in their tongue-in-cheek manner. And there definitely are traditional Catholic leftists, and there definitely are ecofascists.
There's actually a decent amount of fighting between leftists and trad caths in twitter, if spend too much time there I guess. I'm off twitter now, thankfully.
And I wouldn't be surprised to find trad cath socialists there either.
I personally parsed the "trad-cath-leninist" as the most doomed communist-fascist" type of an overly insular specific subgroup of uneducated workers who inevitably are immediately purged if either fascists or communists take over whether they assist in a coup or not. There is no good outcome for the fools unless you count "dying in obscurity because the nation was too stable for them to do anything".
Pine tree I could see as Lebanese nationalist and/or Pacific Northwest ecofascists who are similiar groups. The two would get on like a dumpster fire as the trad-caths wouldn't prioritize the environment and would be bigoted towards them. The eco fascists would find them abominable and feel no affinity since they aren't contributing to their central justifying ideal - even though anybody with sense knows the object of fascism is fascism and the eco would inevitably wind up lipservice at best. While tongue in cheek they are perfect useless idiots who would just get a bunch of innocent people killed if they got remotely close to what they wanted.
https://www.patheos.com/blogs/jappersandjanglers/2016/09/an-...
And "pinetree-eco-fash" refers to ecofascism, which is not uncommon among fascist groups:
https://en.wikipedia.org/wiki/Ecofascism
I was unaware they were feuding on Twitter (since I follow no one in either of those groups), but it doesn't surprise me.