Don’t they mean the Tsplines specific local subdivision scheme with T-Points?
Iirc one can only create them based on pre-existing regular (=quad based) Tsplines
topology as one adds more points to a face but wants it to retain its form –something
which doesn’t work in mesh based SubD modelling.
Your third party modeled Audi doesn’t contain T-Points but Ngons. A limited number of
them would likely convert somehow bobbly wobbly – but without the continuity benefits
of T-points.
What I understand is that Speedform uses openSubdiv for everything which has
plain quad topology. As soon as one adds irregular cuts Tsplines comes into play.