Excellent - why didn't you post it the first time? The web is full of unsubstantiated stuff, please don't let Mayhem sink to the level of Twitter or Facebook.
I did not post a reference because I assumed if anyone wanted to know about Balsa cored engineering structures they would either already know it or could look it up. I also didn't include a reference to what Balsa wood is as I assumed that most modellers would know.
I still believe that it is much better to say that you don't have direct knowledge, but still have something to say that might be of interest, rather than state it is absolute fact or not say it at all. This is always provided that you have a reasonable basis for believing it to be true.
I await referred evidence based confirmation of all posts on this, or any other, forum with interest. I gave it a health warning and as this was, until now, a friendly chat forum I thought that enough.
In fact what I said was incomplete in that it is not merely a demand problem but also a supply problem so I learnt something as well. I grovel a thousand apologies to anyone that I misled.
We both now know something that we didn't after having your faulty (but stated as fact) incomplete research corrected.