No that's not how it works. Bank runs are possible even with full reserve banking. If banks make any loans at all then obviously they don't hold enough cash to redeem all depositors. Regardless of reserve ratios, the only way to reliably prevent bank runs is with a central bank that provides liquidity upon request.
> with full reserve banking. If banks make any loans at all
These are contradictory. The banks with full reserve banking can't make loans from easily withdrawable deposits. They can do that only with term deposits that can't be withdrawn for a specific period
Is it still true though? The Fed averted this through QE by buying assets of questionable value at the face value from the illiquid banks and providing them with enough cash.. didn't they?
That is true, but arguably not a consequence of money being digital, but rather of fractional reserve banking.
Physical vs. digital accounting is largely orthogonal to full/fractional reserve banking.