Seems like I remember a change allowing Vets to seek healthcare from private providers, or from VA hospitals. Under HIPPA, in order for the private provider to get a copy of any of your prior medical information, you would have to fill out a specific release form detailing what to release, and how long the release lasts. Depending on how your records are kept, you might have 1 form to fill out, or you might have multiple forms.
Perhaps this is a way to save you that aggravation.
But if it isn't what you want, you should opt out.
While not a vet, my recent experience with getting an MRI disc from one provider to another involved some difficulty. The Doctor couldn't get it from the Hospital without me first filling out a release form at the hospital, releasing the records to either the Doctor or to myself. If I chose the Doctor, I needed to allow 10-14 days for the Doctor to receive the disc. I chose to release information to myself so I could legally get a copy of the disc, and then I had to transport it myself. Not the first time I've had to fill out Hippa releases to get my medical history from one provider to another.
All that to say, Hippa can be a pain. And if you've relocated, it can be a real pain.