So he basically he agreed that you do need VFS. Great news! I hope you'll achieve a 100% passable voice without any straining !
Vfs is needed for various reasons. But one common reason is to eliminate the male undertones, even for transwomen who are in the upper male range, and who are tired of straining.
My voice is still weak and a bit hoarse even after almost 3 months post vfs. However, regardless of pitch, I think the male undertones have disappeared. It's not all about pitch. I think voice timber and prosody are even more important (provided you're above 160 hz otherwise prosody won't be enough to make your voice passable).
For me the ultimate passability test is the phone. If you can pass on the phone WITHOUT ANY STRAINING WHATSOEVER, just by having the right prosody then your voice is in the female range.
Glad to hear you're srs recovery is going well!