Strategy without tactics is the slowest route to victory. Tactics without strategy is the noise before defeat.

No. The couplet that sets strategy without tactics against tactics without strategy is not in the Chinese text of The Art of War, and it is not in any printed translation. There is no Chinese source line behind it. The earliest appearances are modern, from the early 2000s. Wikiquote places it among the sentences misattributed to Sun Tzu. The other source for that finding is a 2014 note on The Strategy Bridge. However often the couplet is printed beside his name, it does not come from the thirteen chapters.

Sun Tzu does care about calculation before the fight, and about how the fight is then conducted. He never sets the words "strategy" and "tactics" against each other in this aphorism, and he never calls one of them the noise before defeat. Those are modern phrases laid over his name. If you want his own order of operations, use chapter IV, section 15, in Giles: the victorious strategist only seeks battle after the victory has been won. That sentence is in the book. This couplet is not.