The point is that a major morphological change has been directly observed. If they are still sea squirts or not is irrelevant for that purpose.So how many eons do you estimate that it took for this one event to happen and is it proof positive, that the select sea squirts are no longer sea squirts?
And besides, speciation has been observed often enough as well, as you know very well from earlier discussions.
How about your assertion that math doesn't support evolution? Do you back it up? What about the aforementioned genetic algorithms?