[XorNot]

Those seem in no way equivalent. The old definition pretty clearly refers to 1 computer. You could certainly argue that several hosts represented 1 computer, but a judge would throw it out.

The new definition plainly allows "one or more computer networks" which means literally the entire internet since it's just "one or more computer networks".

[bazfoo]

It seems to me that the explicit separation (and vagueness) of 'compter' and 'computer system' seems intended to have the latter cover networks. But perhaps you're right.