You cannot bend the rules in this way and still equate it to the question at hand - you're introducing characters outside of base2 in your example. If you stuck within the realm of base2, '2' in its binary form certainly appears in the pattern.
Not only that, but Pi is normal (all digits distributed evenly), and your sequence clearly is not.
I understand what you are saying - indeed there are infinite finite sequences - but it just does not apply here.
To phrase it another way, there are infinitely many sizes of Infinity.
Just because you have one infinite sequence, does not mean it is the same size as another Infinity and as such may include or exclude elements of the other Infinity.
Not only that, but Pi is normal (all digits distributed evenly), and your sequence clearly is not.
I understand what you are saying - indeed there are infinite finite sequences - but it just does not apply here.