The "in practice" thing is pretty important. In the no-free-lunch version of the world memory is infinite, all mathematical operations are the same performance

The "in practice" thing is pretty important. In the no-free-lunch version of the world memory is infinite, all mathematical operations are the same performance wise and things the size of your floating point numbers are ignored. But "in practice" these things matter a lot. For practical purposes the no-free-lunch theorem is a distraction, or at best something to encourage people to try alternate approaches.