The mechanism there seems to be slightly different. Turchin is looking at detonating objects with unusually high deuterium density in otherwise stable objects with temperatures much lower than the sun. This paper in contrast seems to be talking about primarily detonating regular hydrogen in the sun.

Edit: Now having skimmed Turchin, his scenario is much more plausible and mildly disturbing. The destruction of such an event would be very large scale, but might not be easily visible on an astronomical scale, so one can't a priori rule it out as a Great Filter consideration.