The halting problem requires both

1) unlimited length of programs whose halting behaviour is to be decided (so it can not be limited to program of at most 10 petabytes)

2) for those programs to have unlimited memory available

You're arguing about point 2) in response to a post about point 1).

Well, the post I responded to was a respons to a post about point 2. I simply reiterated OP's point.