Tomatoes are not on the strict diet because some members had reactions to it. Depending on where you are with your treatment, you could test it and see if it causes a reaction for you. Also, I think it has little bit more sugar than other veggies so if you decide to add it to your diet, don’t add it too early and don’t overdo it. It could also mess with the acidity of the gut so caution there as well.
I eat them occasionally and try to limit myself to one tomato per day and not every day. I am three months into the treatment.