I am in their discord at the moment they are from Masterstroke Games and as you pointed out. Have a HEMA background.
The game is set at the moment in 1490s Rome in the Papel election of the Borgia Pope. And the different bands represent different factions, families and nations fighting for influence.
It does use cards in a novel way as well. The different decks with influence how you play and what your force can bring to the table. The rules also encourage you to retreat when you can no longer accomplish the objectives, instead of fighting to the last man.
The first factions repeated are Swiss, French, Spanish, Landsknecht and Italian condottieri.
They plane of expanding into other Italian factions, War of the Roses and the fighting in Greece and the Balkans.
I was playing on making a post, about them sooner but my computer is down at the moment and takeing care of a two year old is taking up all most of my time at the moment.
The rules are also currently miniature agnostic, and since it is a historical setting all you need is a few perry boxes or metels and your ready to go.
This is their YTube channel. It has a few battle reports and a bunch of how to play and rules videos.
https://youtube.com/@MasterstrokeGamesThis is the about page.
http://masterstrokegames.com/And this is their distribution/store front page. Which definitely shows off the HEMA roots of the group.
https://tempusswords.co.uk/