Earlier quoted context omitted.
"Plain English" is the legal equivalent of pseudocode. (By similar reasoning, the courts are analogous to CPUs.) The TOS isn't in plain English for the same reason that Android isn't written in pseudocode: the CPUs won't run it. Also -- pseudocode ignores edge cases, boundary conditions, etc. to make it readable. Production code (and legal documents) can't escape these requirements.
I really like that analogy.
The CPU is a machine, it is deterministic, same input yields same output.
The legal system may try to be as predictable as possible, it is still a human production built on human language, and cannot be deterministic, not even asymptotically.