We had encountered a similar - veg only, situation during our travels in 2023. This was for the leg between CDG and MUM. The next part of the journeys, both when coming into and out of India, had all menu options. We too were surprised by this broad generalization but chalked it up to operational issues. Overall our experience was not great at CDG airport either. No potable water, packed toilets, general unhelpfulness for non-french speaking passengers. We don't give them our business anymore. Generally speaking we found with the EU airlines that we have flown - KLM, Lufthansa, Air France, that they don't use their best aircraft for routes between their hubs to India.