Real Time Tactics might cover a rather broad range of games, not only the Commandos-like, but also Men of War, Aragami, Splinter Cell, Door Kickers, Hot Brass, SWAT 4, etc. I can understand why this "label" is not good enough.
My small circle of likeminded friends are referring to these games with an acronym, BEVRTST which stands for Bird's-Eye-View Real-Time Stealth-Tactics, which I understand why so problematic is due to its length and complicatedness, but it pretty much contains all the components the genre offers.
Mimimi developers themselves mentioned the genre Soulslike which refers to games similar to Dark Souls, this way the easiest way would be to use the term Commandoslike (Commandos-like?), but here again, although Commandos is the founder of the genre, and a game that pretty much everyone knows, I see why Mimimi games wouldn't want to refer to a product which is not theirs, and which is supposed to receive a sequel sometimes in the future with Commandos Origins.
For me Stealth Strategy is as much misleading as Real Time Tactics. Stealth is fine, it's well in the recipe, but for me strategy means completely different and completely alien from games like Commandos. I see that not only in everyday life, but unfortunately in supposed-to-be professional environments too, the terms of strategy and tactics are misused or even swapped with each other. Strategy is a larger scale, longer term, not restricted vision or way of thinking to define a desired state of an organization, a government, an army, a team, etc. Tactics are smaller scale, shorter term, more direct steps or acts supporting the strategy in achieving that desired state, step by step. If we think about the historic setting of Commandos, for the British government and the British army, the goal or vision was to win the war. Their strategy included among others revising their current way of thinking, deciding on which branches of the army to support, which new corps to estabilish, and what kind of engagements they should take on the enemy. Tactics could have defined the way how those single engagements should be arranged, what formations should the soldiers use, etc. Translating this to games, you get to make strategic decisions in games like Hearts of Irons, Civilizations, Stellaris, in the campaign maps of the Total War games (these are often referred to as 4X games or grand strategies), while you may apply tactical decisions in games that let you command a group battlefield units, like the battle maps of the Total War games, Company of Heroes, Starcraft, Men of War, which are for some reason also referred to as Real Time Strategy games, which I'm also not completely satisfied with.
In a Stealth Strategy game I expect to sit in the chair of the Minister of Defence or the Commander in Chief, and tasked with making decisions on how to improve the stealth capabilities of our striking force, like stealth bombers, camouflaged or concealed infantry, etc.
When it comes to deciding that one path of winning the war is deploying small groups of specialists operating behind enemy lines sounds like a strategic decision, while directly controlling one of those groups, deciding how to bypass enemy setups, cripple the enemy's capabilities, and inflict damage silently, these sound like tactical decisions to me. This way, if the term has to change, and it cannot be Commandoslike, I would go with Stealth Tactics.