Since Pi is a transcendental number, there are infinitely many "messages" in Pi (by messages, I mean simple alphabet substitution codes that say XYZ). One of those messages is a number sequence that corresponds to the alphabet substitution code for the following: "Hi, this is the simulation programmer. Keep looking for more messages." (H=8, I=9, etc.) This was explored in Sagan's book Contact, although it had nothing to do with simulation theory. My point is that that particular sequence of numbers that spells out that message about a simulation programmer is in Pi somewhere. Now, if that sequence happened in the first 100 digits, it would be amazing, but why? Since we know that sequence exists, and Pi is infinite, the probability of that sequence of numbers appearing in any specific "spot" either can't be determined (because the probability space is limitless), or is equal to any other "spot". So why would it be so significant if we found a coded message near the beginning of Pi?

0-9 only covers part of the alphabet so any message can only use a-i. That said all possible series must be in there somewhere.