Glad you're on board with these questions. One of the reasons I'd like to get the melted apparatus is to make certain that the tube was Pyrex.
The tubing in the lab was for work at higher temperature and the softening point was one concern I had. How rapidly the melt down occurred was unexpected. It's the reason I suspected something was unusual. I was down to either fusion or redox being responsible, now low melting point is introduced.
If only I could move and get back to my old job, It would be so simple to get an alumina tube, soak some FiberFrax with the NiO paint, stuff into the tube, wrap nichrome onto the tube, place thermocouples and set up the reactor for hydrogen gas. Plot temperature with linear increase of power to reactor and see if run away occurs at 830 C. If so we've created something starlike on earth.
Why do you think this may be important? Even with my poor imagination I foresee a very bad economical effect. Would be interesting if it replicates, but left well enough alone beyond that.