Bowlesia is in the parsely family and that plant sure looks like a parsley. I would think safe but not tasty.
Naturally the Tortoise Table says “do not feed” about parsley but not to worry if your tortoise takes a bite. There are a ton of things in this plant family that are perfectly safe (carrot, dill, coriander) so it’s not a warning that would give me pause but I know you’re cautious.