No. Canon 188 cannot be considered as a final proof that a heretical pope loses his office, simply because the Roman Pontiff is always above the dispositions of the Ecclesiastical law.
You really don't know what you're talking about. There are about a hundred and one ways one can go about arguing this issue. Quite often it is the support from dozens of different angles and evidence from a preponderance of sources which leads to the conclusion, rather than one particular proof. And please do keep in mind, it's Canon 188/4 (or 188.4, 188, 4, 188-4 etc. if you prefer; for those of us who can't manage the paragraph symbol). The other parts of canon 188 really have nothing to do with this, and other parts of it are very much part of the Church's positive law.
But you silly woman, canon 188/4 is not a penalty of the Church's law. You've been told this over and over again, yet you continue to treat it as if it were-- and worse, misconstrue our argument as if it depended on a canonical penalty when it
doesn't. It is merely stating an effect of the Divine law (loss of office due to loss of membership) and incorporating it into the government of the Church. It's no different than any part of the Code which requires a priest with orders for a particular sacramental task; the Code could not make laws governing ordinations without a valid bishop and this has nothing to do with her own positive laws insisting that only ordained men perform such tasks, but everything to do with the Divine Law, that is the very nature of things as ordained by God. Ditto canon 188/4.
Nobody is able to prove that the canonical dispositions of Canon 188 belong to the Divine Law of the Church.
That's the second time you've used that word, "dispositions." It has no place, you just can't think of the right word to use because you don't know what you're even arguing. The footnote in the code appeal to cuм Ex Apostolatus Officio which is standard teaching, put forward most clearly and famously by St. Robert Bellarmine, doctor of the Church and the most impressive and erudite authority on the papacy to ever have lived. In treating the idea of a "heretic pope" he says quite clearly and confidently that the non-Christian cannot in any way be pope, because he cannot be head of that which he is not a member. He further more answers your very objection (that the loss of office proceeds from human law) and points out that the Church fathers, in declaring a heretic without office,
cite no human law but argue from the very nature of heresy.
Not only that, nobody is able to prove that cited Canon (even if it was of Divine Law) applies properly to the specific case of the conciliar popes. Theologians have always been on disagreement on this matter. There is simply not consensus about the case of a heretic pope. But hey, perhaps someone from Bellarmine Forums would like to volunteer with a solid input based on facts and not sentiment? 
First of all, and I think I pointed this out in my last pope, the idea of
losing the office is really only possibly germane in the case of Paul VI. From JPII onward, the argument is that they never possessed it to begin with. If they did, you're still wrong-- you can't cite an authority after Vatican I which teaches that the "heretic pope" keeps his office. And the reason you can't, because I'm sure it's lost on you as you're out lost at sea, is that the pope has no human judge-- something you love to point out until it serves your argument. He judges himself, as it were, with his own actions. There very much is a consensus, certainly after Vatican I, and the only reason there was ever the
minority view of a heretic pope needing to be judged is that Vatican I had not yet defined that the pope has no human judge (though most believed this anyways, which is why the contrary view is a small minority).