Does Tomato Damage a Wok's Seasoning?
From experimental evidence*: Yes. Wet and acidic braising sauces (as you have in indian cooking) that stay in the wok for a long time are quite aggressive on the seasoning. A contributing factor could be rapid thermal changes when cold, wet ingredients are added to a hot mixture.

Also, in many cases the seasoning in cookware used for sundry purposes isn't exactly perfect - there can be spots where there is very thin or no seasoning covered by carbon deposits which can be underwashed or soaked if the pan is flooded with liquid for a long time, both softening these carbon crusts and allowing the liquid to attack the metal underneath.

*An extreme example: making american-chinese style spring roll or pineapple sweet-sour - plenty of vinegar, fruit juice, tomato balanced by plenty sugar. Seen that take a significant amount of the seasoning off a cast iron wok within half an hour.