Rather than adding a correction, it's probably more accurate to just say that the mouse replies when the sofrtware asks. As you know, when you control the AMX mouse in Basic the pulses are every 1/50s, so it's variable depending on the software, just as the real AMX mouse was.
:> Ok, I removed the 1/300s bit from the Table, as the page only describes the hardware and not the software, this is probably the most accurate. The mouse sampling rates should be mentioned on the Art package / OS pages that support mouse input.