Andrew, you seem to be just taking the definition of ‘risk’ as ‘volatility’ and beating people over the head with it.
Most other people, myself included, seem to be consciously and deliberately applying the ordinary meaning of the words ‘risk’/‘risky’/‘riskier’.
I stand by my contention that over a 20+ year time horizon from this point, a €4m cash deposit is ‘riskier’ than €4m invested in (say) an MSCI All Country World Index tracker. Inflation is a real risk for cash deposits (no pun intended). A ‘bail-in’ of depositors is also a risk, albeit a less significant one.
People are less concerned with inflation in the context of equities because both the nominal returns and the real returns tend to be positive over time. Deposits, on the other hand, seem destined to yield negative real returns for the foreseeable future.
Taking the original poster, he/she has €4.2m in cash, no debt, they’re 40, and they still earn a substantial income. Volatility should be of no relevance to this person; it’s a very poor ‘measure’ of risk.