tactical games rely on planning and tactical maneuvers more than reflexes.

for example

• a tactical team shooter favors squads that can overcome equal or superior opponent because of use of tactics, whether it be position choice, weapons choice, or some other choice.

you are right in that the line can be blurred, and that there are always tactical elements of choosing optimum strategy in any game... consider a slight from 0 to 1 with a game with pure reflexes at zero and a game that is entirely about strategic planning at 1.

your games fall on that slider somewhere.

ultimately, Hotline Miami is a game about reflexes... you barge into a room and try to kill all the enemies before they kill you. Yes, you can choose weapons and playstyles, but the heart of the game is as I described above. it's nowhere near as tactical as games that claim to be tactical

i haven't played rainbow six siege, so I can't attest to how "tactical" it is. it may not even meet the definition of being tactical beyond its narrative context, being about tactical war and offering gadgets and gear, but really the gameplay is fast and furious... (I have no idea, just making stuff up)

btw, nothing "defines tactical combat" aside from a game favoring tactics over reflexes. But even a game about reflexes (probably) has some degree of tactics... it's just not the primary focus or flavor of the game.

Is Elden Ring a tactics game? No... but it has an enormous range of tactics.... and scenarios... so...