The Architect was off in terms of the ACTUAL time it takes for the earth to rotate - 86,164,100 milliseconds. What a "stellar" mistake for numerical perfection. Did The Architect screw up the math?
Our "original" definition of seconds was in term of our earth's rotation so it is exactly OPs number. We just changed our definition to a more constant second that slightly varies from our old definition.
But "milli" implies the metric system's version of a second, which is defined as per the decay of a caesium-133 atom. I doubt very much The Architect wanted us to mix our units of measure, unless The Architect was referring to that window of time where "milli" existed, but we hadn't yet changed the second to a uniform length of time (as opposed to one that would be affected by the variable rotation of the earth). If so, we are already past His golden age.
If I ever meet the referenced fictional character from the Matrix trilogy I'll be sure to ask.
There was never a Matrix trilogy, there was one very good movie and that was it.