That's not completely clear. He didn't list his reserve service, but he did request the Report of Separation for "all years".
Using a Form 180 is like using an ATM for your bank accounts. It can be tailored to to give out as much or as little as you choose.
When you use an ATM card, you choose where you want the cash to come from (Checking Account or Savings Account) and then how much ($50, $100, $200, etc.)
Likewise, the Form 180 gives you choices:
1. What branch or branches of service? (Some vets have served in more than one branch of service.)
2. For your branch of service, do you want your Active Duty time, your Reserve duty time or both?
3. For the choices you made, which time period would you want released? All years? Only 1969? Only 1967 and 1969 but not 1968? Only 21 June 1969?
So, as you can see, you can have hundreds of ways of tailoring the information.
Kerry specified:
1. Navy records.
2. Active duty period only.
3. All years.
The "Separation" in this case would be "Separation from Active Duty" which means you go from Active Duty status to Ready Reserve status for the number of years specified in your service contract.
If Kerry was given a Dishonorable Discharge (as a result of his activities in Vietnam Veterans Against the War while serving his Ready Reserve years) that was later upgraded as a result of the Jimmy Carter Amnesty Program, we would never know from this Form 180 request because it specifically prohibited the release the records of his non-active duty time.
I suspect that 1) the records request was intentionally done so that the result would be incomplete and 2) the records were released only to people who wouldn't know (or care) that was the case.