I think Elon is justified for taking a public stance to protect his own interests. As his companies develop products with the same battery technology, it is likely that the hazards of the Boeing battery design could become associated to the entire battery technology. This would be disastrous for his organizations. I consider this a pre-emptive defensive move against technically ignorant public and media.
Boeing has a strong reputation and will surely weather this mess just fine by identifying corrective action and doing the right thing.
