Unfortunately, I disagree with your attorney down here in Miami (I am down here as well). I have seen persons that have been here 20+ years as residents and they still get deported for an aggravated felony.
And no, I cannot give you a link. As I said, you would need to post your Canadian law questions in the Canada Law forum. I was trying to be helpful with the guess (an educated one, I might add). Sorry I was not helpful in that regard.
But as far as deportability, let me quote law for you so you understand how wrong your immigration attorney is. The following crimes are considered aggravated felonies and as such as deportable offenses regardless of how much time you have as a U.S. Lawful Permanent Resident:
INA §101(a)(43)(A) rape and sexual abuse of minor regardless of the sentence or date of conviction
INA §101(a)(43)(F) a crime of violence for which the term of imprisonment is at least one year;
INA §101(a)(43)(I) offense relating to child pornography
Now since your crime was reduced in nature to aggravated child abuse, you may not have to worry about (A) or (I), but I think abuse would fall under crime of violence and since you were sentenced to 1 year in prison, this would be enough to get you deported from the U.S.
I hope you understand the gravity of the situation. I don't like giving bad news. If you don't believe me, just do a Google search for "Aggravated Felonies" and deportation or removal. You will find plenty of material to read. If you don't trust the internet (and you shouldn't), go see another immigration attorney for a 2nd opinion (or 3rd in this case), but make sure that the immigration attorney that you see has plenty of experience in criminal matters. There are different types of immigration attorneys and the one you spoke to may have a great deal of experience in business immigration or family immigration, but very little in immigration consequences of criminal activity or removal proceedings. There is an expert on this site that has double or more the years of experience than I do in "immigration law", but most of it is in business immigration. She doesn't even touch the criminal immigration questions because she does not have experience in them.