I'm a retired NYS peace officer, and I did my research when I retired. I read everything I could on HR218, then LEOSA, then the amendments to LEOSA.
Everything I've read shows that the intent of HR218 and LEOSA was to exempt active and retired officers from being subject to any state's licensing law. Yes, NYS requires pistols be listed on a license, but you don't need a license to possess and carry in NY under LEOSA.
It allows you to carry, but does not exempt you from other local laws re: where you can carry, or how many rounds you can carry. If the local laws says 10 rounds, it's 10 rounds. The only provision that overrules local statute is allowing you to carry hollow points in states that would otherwise ban them for private citizens, which is what you are when in another state, regardless of your LEO status in your home state.
I have read several court's findings, and they pretty much follow the federal law, i.e. LEOSA's intent was to exempt officers from local licensing laws. If there is a murky area, it's who is a "qualified" officer under LEOSA, but even there, the courts have ruled in favor of defts. who you might not think would be qualified, i.e., Coast Guard members. Courts have found them to have police powers when on duty, and have ruled they are thus qualified under LEOSA off duty.
As previously stated, in order to be "qualified" as a retired officer, you must carry on your person 2 documents: your retired officer ID card, and a card, signed by a police training officer or a private trainer qualified to teach and test according to local state requirements, for example, an NRA police trainer, stating you qualified within the last year with either a semi-auto, revolver, or both. If only one, you may only carry that type of pistol. You must re-qualify every year according to the standards of the state you live in, not necessarily the state you retired from.
With those 2 documents, you are good to go in any state without a local license.
I am not an attorney, nor, having come in contact with so many during 40 years of service, do I wish to be one. But keep in mind, unless an attorney specializes in LEOSA law, or has done work in that area, he or she may not know any more about it than you do. I don't doubt there are many lawyers who have no idea what LEOSA is, or have ever heard of it. If you seek advice, make sure the lawyer you are asking has a good handle on what they're talking about.