Why I am not a vegan

[βαθμιαίος]

I don't think Ra advocated the eating of meat at all, for anyone, even Carla. I think that quote is simply congruent with the way Ra always avoided telling them exactly what to do, in respect to free will. Ra acknowledged that Carla already ate meat, and gave advice in accordance with her choices.

I'm sure you're familiar with the two uses of the word "meat" in the sessions.  To me, both seem to be cases where Ra is advising Carla to eat meat, and I'm pretty sure that's how Carla understood them, too.

18.4 Questioner: Are there any foods that are helpful or harmful that the instrument might eat?

Ra: I am Ra. This instrument has body complex distortion towards ill health in the distortion direction corrected best by ingestion of the foodstuffs of your grains and your vegetables, as you call them. However, this is extremely unimportant when regarded as an aid with equality to other aids such as attitude which this instrument has in abundance. It, however, aids the vital energies of this instrument, with less distortion towards ill health, to ingest foodstuffs in the above manner with occasional ingestion of what you call your meats, due to the instrument’s need to lessen the distortion towards low vital energy.

102.16 Questioner: Would Ra please mention which foods are highly probable in not causing any spasming in the instrument’s digestive system?

Ra: I am Ra. The liquids not containing carbonation, the well-cooked vegetable which is most light and soft, the well-cooked grains, the non-fatted meat such as the fish. You may note that some recommended foodstuffs overlap allergies and sensitivities due to the juvenile rheumatoid arthritic distortions. Further, although sugar such as is in your sweetened desserts represents a potential, we may suggest that it be included at this period for aforementioned reasons.

Here's a quote from Carla's A Channeling Handbook about the subject:

One other cause of indulging among channels is the need for earth-heavy food while channeling high energies. If you are losing weight while eating normally, you’ll need to eat meat, the redder and rarer the better. Sorry.

I think that Carla was convinced that she wouldn't have been able to continue bringing the Law of One sessions through without meat, and I think Ra affirmed the helpfulness for her of eating meat in the quotes above.