The Influences Of Ableism in Veganism: A Disabled Vegan Perspective | Vegan Feminist Network
(veganfeministnetwork.com)
I'm sure that's happened. Some can be monomaniacal, especially those where veganism is their only branch into liberatory politics.
Here though she's more talking about the pressure to minimize chronic illness and downplay disability due to not wanting to play into the "vegans are weak" myth (aka the protein myth). I've done this myself and still catch myself doing so occasionally. Part of it is self-imposed as she admits, but the expectations can be read between the lines of some mainstream messaging.