Certainly what was witnessed wasn’t the transition from a single celled creature to a complex multicellular one. That the single cells persisted living and reproducing as colonial creatures is still interesting, but I agree that it is hard to see how the path toward specialization of cells and complex communication between them arises from there.
Maybe the take away is that single celled forms, or at least those of some algae, show no reluctance to living communally. In fact, I doubt if it makes any sense to impute subjective states of any kind to single celled creatures as it is hard to imagine where any complex cognition could even take place.
In the end those inclined to believe the path taken toward complex multicellularity was entirely natural will continue in that supposition until given a reason to abandon it while those inclined toward creation will do the same for their supposition. Not knowing every step taken toward complex multicellular animals does not privilege either supposition, but neither does it rule it out.