I don't think their products are Vegan, and may not even be Vegetarian!
I have recently learned that "Plant Based" does not mean Vegan or even Vegetarian. I have tried contacting Plantein to get confirmation as to whether they use animal products to no avail...
I've tried their online contact page, and have sent a personal email to the contact address given below.
I have not called because I like this important information to be presented in written form, as people can say anything, but deny what they say afterword.
Although their website says they offer Vegetarian and Vegan options, I have noticed that none of their packaging states that the food is suitable for either.
On my personal email, I actually asked them which products are vegan, to which I did not receive a reply.
To make matters more concerning, their website actually promotes a flexitarian diet, meaning they think it is OK to eat animals and their products, which makes one think they may not have issue adding Beef or Chicken stock to their products and labelling it as "Natural Flavours".
In all honesty I do not feel as though I can trust this company, and recommend you do the same until they confirm that their products are suitable for Vegans and Vegetarians.