They may be throwing WPATH at you because the requirements for any kind of downstairs surgery are a year of RLE. My doctor and surgeon have both interpreted that as my one year on hormones date, but I have heard some that will only start to track the time after you've been on HRT and have legally and socially transitioned.
I would just be straight up with them, and I would actually encourage you to send it in writing so that you can have a record of their response (or lack thereof). The email I wrote my doctor was:
"Hey NAME,
We have an appointment scheduled for 9/15 and I wanted to talk to you about referrals for surgery. I will need 1 from you and 2 from the mental health team. Can you refer me to them so I can schedule an appointment now? Is there any info that you'd need from me that you don't already have access to in order to write a referral?"
Her response was that we could fill out the referral template together at that appointment and she referred me to the mental health team to get those referrals, BUT because I was still 3 months shy of my 1 year on HRT, I'd have to wait to get the referrals until then. So they were all written at that point, I just had to make an appointment to pick them up.
Hope this helps!