I confuse terms a lot, Dyslexia, sorry. But isn't that the desired quality with a tang? To flex rather than break? One reason many of us make our tangs dead soft.
The tang is not getting the same amount of working stress as the blade itself, also even with a lower flex measurement of the 6011's 60,000 vs the steels 100,000+, is plenty. I don't want to argue semantics, it defeats the purpose of our discussion, a strong functional tang weld. Jhomney or charpy testing can show it is weaker, but but enough to matter?