u0 in those model cards is the surface mobility (you
want to sanity-check units & so on, relative to your
simulator-of-choice's defaults).
toxe is your "electrical oxide thickness" as distinct
from optical / actual, it may include some poly depletion
or be fudged to get a right result. Anyway, this goes in
your C=E*E0*A/t calculation.
In both of these cases second-order related params
look to be populated and you'd have to dope out how
those might modify the declared basic param.
Reading the unpleasantly long and detailed BSIM model
docs would do you some good, if you wanted to know
what you're looking at.