As far as I can see this means, basically, that you get the unsustainability and cruelty, but without the butter and cream.
It takes all sorts, doesn't it?
Word Not To Use Today: seagan. This diet, and the word which goes with it, was created in 2016 by Amy Cramer and Lisa McComsey.
Being a seagan does, apparently, make a nutritionally balanced diet easier to obtain than being purely vegan.
Adding meat and dairy products would make it even easier, I should imagine, but I don't think there's a word for that.
The Old English form of the word sea was sǣ.