allowing up to 75 devices to be found per second
That quote is concerned with the rate at which devices can be found by address detection. And it is a RATE, not a number of devices. If you can find 25 devices in 1/3 of a second, or 225 devices in 3 seconds, you get that detection RATE. It doesn't mean that you can actually have 75, or 25, or 225 devices on your network. The address detection process for the 1-wire scheme is a separate issue from actually reading data from the sensors.
There is no specific limit to the number of devices, it is determined by electrical issues related to the capacitance and impedance of your wiring. It varies depending on how long your wires are.
Read this